Provided by: zsh_4.3.11-4ubuntu2.is.3ubuntu2_i386 bug

NAME

       zshzle - zsh command line editor

DESCRIPTION

       If the ZLE option is set (which it is by default in interactive shells)
       and the shell input is attached to the terminal, the user  is  able  to
       edit command lines.

       There  are  two  display  modes.   The  first,  multiline  mode, is the
       default.  It only works if  the  TERM  parameter  is  set  to  a  valid
       terminal  type  that  can  move the cursor up.  The second, single line
       mode, is used if TERM is invalid or incapable of moving the cursor  up,
       or  if the SINGLE_LINE_ZLE option is set.  This mode is similar to ksh,
       and uses no termcap sequences.  If TERM is "emacs", the ZLE option will
       be unset by default.

       The  parameters  BAUD,  COLUMNS,  and  LINES  are also used by the line
       editor.  See Parameters Used By The Shell in zshparam(1).

       The parameter zle_highlight is  also  used  by  the  line  editor;  see
       Character  Highlighting  below.  Highlighting of special characters and
       the  region  between  the  cursor   and   the   mark   (as   set   with
       set-mark-command  in  Emacs  mode)  is enabled by default; consult this
       reference for more information.  Irascible conservatives will  wish  to
       know that all highlighting may be disabled by the following setting:

              zle_highlight=(none)

KEYMAPS

       A  keymap  in  ZLE contains a set of bindings between key sequences and
       ZLE commands.  The empty key sequence cannot be bound.

       There can be any number of keymaps at any time, and each keymap has one
       or  more names.  If all of a keymap's names are deleted, it disappears.
       bindkey can be used to manipulate keymap names.

       Initially, there are six keymaps:

       emacs  EMACS emulation
       viins  vi emulation - insert mode
       vicmd  vi emulation - command mode
       isearch
              incremental search mode
       command
              read a command name
       .safe  fallback keymap

       The `.safe' keymap is special.  It can never be altered, and  the  name
       can  never be removed.  However, it can be linked to other names, which
       can be removed.  In the future other  special  keymaps  may  be  added;
       users  should  avoid  using  names  beginning  with  `.'  for their own
       keymaps.

       In addition to these names, either `emacs' or `viins' is also linked to
       the  name `main'.  If one of the VISUAL or EDITOR environment variables
       contain the string `vi' when the  shell  starts  up  then  it  will  be
       `viins',  otherwise  it  will  be `emacs'.  bindkey's -e and -v options
       provide a convenient way to override this default choice.

       When the editor starts up, it will select the `main' keymap.   If  that
       keymap doesn't exist, it will use `.safe' instead.

       In  the `.safe' keymap, each single key is bound to self-insert, except
       for ^J (line feed) and ^M (return)  which  are  bound  to  accept-line.
       This is deliberately not pleasant to use; if you are using it, it means
       you deleted the main keymap, and you should put it back.

   Reading Commands
       When ZLE is reading a command from the terminal, it may read a sequence
       that  is  bound  to some command and is also a prefix of a longer bound
       string.  In this case ZLE will wait a  certain  time  to  see  if  more
       characters  are  typed,  and  if  not  (or  they don't match any longer
       string) it will execute the binding.  This timeout is  defined  by  the
       KEYTIMEOUT  parameter;  its default is 0.4 sec.  There is no timeout if
       the prefix string is not itself bound to a command.

       The key timeout is also applied when ZLE is reading the  bytes  from  a
       multibyte  character  string when it is in the appropriate mode.  (This
       requires that the shell  was  compiled  with  multibyte  mode  enabled;
       typically  also  the  locale  has  characters  with the UTF-8 encoding,
       although any multibyte  encoding  known  to  the  operating  system  is
       supported.)   If the second or a subsequent byte is not read within the
       timeout period, the shell acts as if ? were typed and resets the  input
       state.

       As  well  as ZLE commands, key sequences can be bound to other strings,
       by using `bindkey -s'.  When such a sequence is read,  the  replacement
       string  is pushed back as input, and the command reading process starts
       again using these  fake  keystrokes.   This  input  can  itself  invoke
       further  replacement  strings, but in order to detect loops the process
       will be stopped if there are twenty such replacements  without  a  real
       command being read.

       A  key sequence typed by the user can be turned into a command name for
       use in user-defined widgets with  the  read-command  widget,  described
       below.

ZLE BUILTINS

       The  ZLE  module  contains  three related builtin commands. The bindkey
       command manipulates keymaps and key bindings; the vared command invokes
       ZLE  on the value of a shell parameter; and the zle command manipulates
       editing widgets and allows command line access  to  ZLE  commands  from
       within shell functions.

       bindkey [ options ] -l [ -L ] [ keymap ... ]
       bindkey [ options ] -d
       bindkey [ options ] -D keymap ...
       bindkey [ options ] -A old-keymap new-keymap
       bindkey [ options ] -N new-keymap [ old-keymap ]
       bindkey [ options ] -m
       bindkey [ options ] -r in-string ...
       bindkey [ options ] -s in-string out-string ...
       bindkey [ options ] in-string command ...
       bindkey [ options ] [ in-string ]
              bindkey's  options  can be divided into three categories: keymap
              selection for the  current  command,  operation  selection,  and
              others.  The keymap selection options are:

              -e     Selects  keymap `emacs' for any operations by the current
                     command, and also links `emacs' to `main' so that  it  is
                     selected by default the next time the editor starts.

              -v     Selects  keymap `viins' for any operations by the current
                     command, and also links `viins' to `main' so that  it  is
                     selected by default the next time the editor starts.

              -a     Selects  keymap `vicmd' for any operations by the current
                     command.

              -M keymap
                     The keymap specifies a keymap name that is  selected  for
                     any operations by the current command.

              If  a keymap selection is required and none of the options above
              are used, the `main' keymap is used.   Some  operations  do  not
              permit a keymap to be selected, namely:

              -l     List  all  existing  keymap  names;  if any arguments are
                     given, list just those keymaps.

                     If the -L option is  also  used,  list  in  the  form  of
                     bindkey commands to create or link the keymaps.  `bindkey
                     -lL main' shows which keymap is linked to `main', if any,
                     and  hence  if  the  standard emacs or vi emulation is in
                     effect.  This option  does  not  show  the  .safe  keymap
                     because  it  cannot  be created in that fashion; however,
                     neither is `bindkey -lL .safe' reported as an  error,  it
                     simply outputs nothing.

              -d     Delete  all  existing  keymaps  and  reset to the default
                     state.

              -D keymap ...
                     Delete the named keymaps.

              -A old-keymap new-keymap
                     Make the new-keymap name an alias for old-keymap, so that
                     both  names  refer  to  the  same keymap.  The names have
                     equal standing; if either is deleted, the other  remains.
                     If there is already a keymap with the new-keymap name, it
                     is deleted.

              -N new-keymap [ old-keymap ]
                     Create a new  keymap,  named  new-keymap.   If  a  keymap
                     already  has  that name, it is deleted.  If an old-keymap
                     name is given, the new keymap  is  initialized  to  be  a
                     duplicate of it, otherwise the new keymap will be empty.

              To  use  a  newly  created  keymap, it should be linked to main.
              Hence the sequence of commands to create and use  a  new  keymap
              `mymap'   initialized  from  the  emacs  keymap  (which  remains
              unchanged) is:

                     bindkey -N mymap emacs
                     bindkey -A mymap main

              Note that while `bindkey -A newmap main' will work  when  newmap
              is emacs or viins, it will not work for vicmd, as switching from
              vi insert to command mode becomes impossible.

              The following operations act on the `main' keymap if  no  keymap
              selection option was given:

              -m     Add the built-in set of meta-key bindings to the selected
                     keymap.   Only  keys  that  are  unbound  or   bound   to
                     self-insert are affected.

              -r in-string ...
                     Unbind  the  specified in-strings in the selected keymap.
                     This is exactly equivalent  to  binding  the  strings  to
                     undefined-key.

                     When -R is also used, interpret the in-strings as ranges.

                     When  -p  is  also used, the in-strings specify prefixes.
                     Any binding that has the given in-string as a prefix, not
                     including  the  binding for the in-string itself, if any,
                     will be removed.  For example,

                            bindkey -rpM viins '^['

                     will  remove  all  bindings  in  the   vi-insert   keymap
                     beginning  with  an  escape  character  (probably  cursor
                     keys), but leave the binding  for  the  escape  character
                     itself (probably vi-cmd-mode).  This is incompatible with
                     the option -R.

              -s in-string out-string ...
                     Bind each in-string to each out-string.   When  in-string
                     is  typed,  out-string will be pushed back and treated as
                     input  to  the  line  editor.   When  -R  is  also  used,
                     interpret the in-strings as ranges.

              in-string command ...
                     Bind  each  in-string  to each command.  When -R is used,
                     interpret the in-strings as ranges.

              [ in-string ]
                     List key bindings.  If an  in-string  is  specified,  the
                     binding   of  that  string  in  the  selected  keymap  is
                     displayed.  Otherwise, all key bindings in  the  selected
                     keymap  are  displayed.  (As a special case, if the -e or
                     -v option is used alone, the keymap is  not  displayed  -
                     the  implicit  linking  of keymaps is the only thing that
                     happens.)

                     When the  option  -p  is  used,  the  in-string  must  be
                     present.   The  listing shows all bindings which have the
                     given  key  sequence  as  a  prefix,  not  including  any
                     bindings for the key sequence itself.

                     When  the  -L  option is used, the list is in the form of
                     bindkey commands to create the key bindings.

       When the -R option is used as noted above, a valid  range  consists  of
       two  characters,  with  an  optional  `-' between them.  All characters
       between the two specified, inclusive, are bound as specified.

       For either in-string or out-string, the following escape sequences  are
       recognised:

       \a     bell character
       \b     backspace
       \e, \E escape
       \f     form feed
       \n     linefeed (newline)
       \r     carriage return
       \t     horizontal tab
       \v     vertical tab
       \NNN   character code in octal
       \xNN   character code in hexadecimal
       \M[-]X character with meta bit set
       \C[-]X control character
       ^X     control character

       In  all  other  cases,  `\' escapes the following character.  Delete is
       written as `^?'.  Note that `\M^?' and `^\M?' are  not  the  same,  and
       that  (unlike  emacs),  the  bindings  `\M-X'  and  `\eX'  are entirely
       distinct, although  they  are  initialized  to  the  same  bindings  by
       `bindkey -m'.

       vared [ -Aache ] [ -p prompt ] [ -r rprompt ]
         [ -M main-keymap ] [ -m vicmd-keymap ]
         [ -t tty ] name
              The  value of the parameter name is loaded into the edit buffer,
              and the line editor is invoked.  When the editor exits, name  is
              set  to  the  string  value returned by the editor.  When the -c
              flag is given, the parameter is created if  it  doesn't  already
              exist.   The  -a  flag  may  be given with -c to create an array
              parameter, or the -A flag to create an  associative  array.   If
              the  type of an existing parameter does not match the type to be
              created, the parameter is unset and recreated.

              If an array or array slice is being edited, separator characters
              as  defined  in  $IFS  will be shown quoted with a backslash, as
              will backslashes themselves.  Conversely, when the  edited  text
              is  split  into  an  array,  a  backslash  quotes an immediately
              following separator character or  backslash;  no  other  special
              handling   of   backslashes,  or  any  handling  of  quotes,  is
              performed.

              Individual elements  of  existing  array  or  associative  array
              parameters may be edited by using subscript syntax on name.  New
              elements are created automatically, even without -c.

              If the -p flag is given, the following string will be  taken  as
              the prompt to display at the left.  If the -r flag is given, the
              following string gives the prompt to display at the  right.   If
              the  -h flag is specified, the history can be accessed from ZLE.
              If the -e flag is given, typing ^D (Control-D) on an empty  line
              causes vared to exit immediately with a non-zero return value.

              The  -M  option gives a keymap to link to the main keymap during
              editing, and the -m option gives a keymap to link to  the  vicmd
              keymap during editing.  For vi-style editing, this allows a pair
              of  keymaps  to  override  viins  and  vicmd.   For  emacs-style
              editing,  only -M is normally needed but the -m option may still
              be used.  On exit, the previous keymaps will be restored.

              If `-t tty' is given, tty is the name of a terminal device to be
              used  instead of the default /dev/tty.  If tty does not refer to
              a terminal an error is reported.

       zle
       zle -l [ -L | -a ] [ string ... ]
       zle -D widget ...
       zle -A old-widget new-widget
       zle -N widget [ function ]
       zle -C widget completion-widget function
       zle -R [ -c ] [ display-string ] [ string ... ]
       zle -M string
       zle -U string
       zle -K keymap
       zle -F [ -L ] [ fd [ handler ] ]
       zle -I
       zle widget [ -n num ] [ -Nw ] [ -K keymap ] args ...
              The  zle  builtin  performs  a  number  of   different   actions
              concerning ZLE.

              With no options and no arguments, only the return status will be
              set.  It is zero if ZLE is currently active and widgets could be
              invoked using this builtin command and non-zero otherwise.  Note
              that even if non-zero status  is  returned,  zle  may  still  be
              active  as  part  of  the completion system; this does not allow
              direct calls to ZLE widgets.

              Otherwise, which operation it performs depends on its options:

              -l [ -L | -a ]
                     List all existing user-defined widgets.  If the -L option
                     is  used,  list in the form of zle commands to create the
                     widgets.

                     When combined with the -a option, all  widget  names  are
                     listed,  including  the builtin ones. In this case the -L
                     option is ignored.

                     If at least one string is given, nothing will be  printed
                     but  the  return  status  will be zero if all strings are
                     names of existing widgets (or of user-defined widgets  if
                     the  -a  flag  is not given) and non-zero if at least one
                     string is not a name of an defined widget.

              -D widget ...
                     Delete the named widgets.

              -A old-widget new-widget
                     Make the new-widget name an alias for old-widget, so that
                     both  names  refer  to  the  same widget.  The names have
                     equal standing; if either is deleted, the other  remains.
                     If there is already a widget with the new-widget name, it
                     is deleted.

              -N widget [ function ]
                     Create a user-defined widget.   If  there  is  already  a
                     widget  with the specified name, it is overwritten.  When
                     the new widget is invoked from  within  the  editor,  the
                     specified  shell function is called.  If no function name
                     is specified, it defaults to the same name as the widget.
                     For  further  information,  see  the  section  Widgets in
                     zshzle(1).

              -C widget completion-widget function
                     Create a user-defined completion widget named widget. The
                     completion   widget   will   behave   like  the  built-in
                     completion-widget    whose    name    is     given     as
                     completion-widget. To generate the completions, the shell
                     function  function   will   be   called.    For   further
                     information, see zshcompwid(1).

              -R [ -c ] [ display-string ] [ string ... ]
                     Redisplay  the  command  line;  this is to be called from
                     within a user-defined widget to allow changes  to  become
                     visible.   If  a  display-string  is given and not empty,
                     this is shown in the status line (immediately  below  the
                     line being edited).

                     If  the  optional strings are given they are listed below
                     the prompt in  the  same  way  as  completion  lists  are
                     printed.  If  no  strings  are given but the -c option is
                     used such a list is cleared.

                     Note that this option is only useful for widgets that  do
                     not  exit  immediately after using it because the strings
                     displayed will be erased immediately  after  return  from
                     the widget.

                     This  command  can  safely be called outside user defined
                     widgets; if zle is active, the display will be refreshed,
                     while  if  zle  is not active, the command has no effect.
                     In this case there will usually be no other arguments.

                     The status is zero if zle was active, else one.

              -M string
                     As with the -R option, the string will be displayed below
                     the  command  line; unlike the -R option, the string will
                     not be put into the  status  line  but  will  instead  be
                     printed  normally  below the prompt.  This means that the
                     string will still be displayed after the  widget  returns
                     (until it is overwritten by subsequent commands).

              -U string
                     This  pushes  the characters in the string onto the input
                     stack  of  ZLE.   After  the  widget  currently  executed
                     finishes  ZLE  will  behave  as  if the characters in the
                     string were typed by the user.

                     As ZLE uses a stack, if this option  is  used  repeatedly
                     the  last  string pushed onto the stack will be processed
                     first.  However, the characters in each  string  will  be
                     processed  in  the  order  in  which  they  appear in the
                     string.

              -K keymap
                     Selects the keymap named keymap.  An error  message  will
                     be displayed if there is no such keymap.

                     This  keymap  selection  affects  the  interpretation  of
                     following keystrokes within this invocation of ZLE.   Any
                     following  invocation  (e.g., the next command line) will
                     start as usual with the `main' keymap selected.

              -F [ -L ] [ fd [ handler ] ]
                     Only available if your system supports one of the  `poll'
                     or `select' system calls; most modern systems do.

                     Installs handler (the name of a shell function) to handle
                     input from file descriptor fd.  When zle is attempting to
                     read data, it will examine both the terminal and the list
                     of handled fd's.  If data becomes available on a  handled
                     fd,  zle will call handler with the fd which is ready for
                     reading as the only argument.  If  the  handler  produces
                     output  to  the  terminal, it should call `zle -I' before
                     doing so (see below).  The handler should not attempt  to
                     read  from  the terminal.  Note that zle makes no attempt
                     to check  whether  this  fd  is  actually  readable  when
                     installing  the  handler.   The  user must make their own
                     arrangements for handling the file descriptor when zle is
                     not active.

                     Any  number  of  handlers for any number of readable file
                     descriptors may be installed.  Installing a  handler  for
                     an  fd  which  is  already  handled  causes  the existing
                     handler to be replaced.

                     If no handler is given, but an fd is present, any handler
                     for  that  fd  is  removed.   If  there is none, an error
                     message is printed and status 1 is returned.

                     If no arguments are given, or the -L option is  supplied,
                     a  list  of  handlers  is  printed in a form which can be
                     stored for later execution.

                     An fd (but not a handler) may optionally  be  given  with
                     the  -L  option; in this case, the function will list the
                     handler if any, else silently return status 1.

                     Note  that  this  feature  should  be  used  with   care.
                     Activity on one of the fd's which is not properly handled
                     can cause the terminal to become unusable.

                     Here is a  simple  example  of  using  this  feature.   A
                     connection to a remote TCP port is created using the ztcp
                     command; see the description of the zsh/net/tcp module in
                     zshmodules(1).   Then a handler is installed which simply
                     prints out any data which  arrives  on  this  connection.
                     Note that `select' will indicate that the file descriptor
                     needs  handling  if  the  remote  side  has  closed   the
                     connection; we handle that by testing for a failed read.
                            if ztcp pwspc 2811; then
                              tcpfd=$REPLY
                              handler() {
                                zle -I
                                local line
                                if ! read -r line <&$1; then
                                  # select marks this fd if we reach EOF,
                                  # so handle this specially.
                                  print "[Read on fd $1 failed, removing.]" >&2
                                  zle -F $1
                                  return 1
                                fi
                                print -r - $line
                              }
                              zle -F $tcpfd handler
                            fi

              -I     Unusually,  this  option  is most useful outside ordinary
                     widget functions, though it may be used within if  normal
                     output  to  the terminal is required.  It invalidates the
                     current zle display in preparation for output;  typically
                     this  will  be from a trap function.  It has no effect if
                     zle is not active.  When a trap exits, the  shell  checks
                     to   see  if  the  display  needs  restoring,  hence  the
                     following will print output in  such  a  way  as  not  to
                     disturb the line being edited:

                            TRAPUSR1() {
                                # Invalidate zle display
                              [[ -o zle ]] && zle -I
                                # Show output
                              print Hello
                            }

                     In  general,  the  trap function may need to test whether
                     zle is active before using this method (as shown  in  the
                     example),  since  the  zsh/zle  module  may  not  even be
                     loaded; if it is not, the command can be skipped.

                     It is possible to call  `zle  -I'  several  times  before
                     control  is returned to the editor; the display will only
                     be invalidated the first time to minimise disruption.

                     Note that there are normally better ways of  manipulating
                     the  display  from  within zle widgets; see, for example,
                     `zle -R' above.

                     The returned status is zero if zle was invalidated,  even
                     though  this may have been by a previous call to `zle -I'
                     or by a system notification.  To test if a zle widget may
                     be  called  at  this point, execute zle with no arguments
                     and examine the return status.

              widget [ -n num ] [ -Nw ] [ -K keymap ] args ...
                     Invoke the specified widget.  This can only be done  when
                     ZLE   is   active;   normally   this  will  be  within  a
                     user-defined widget.

                     With  the  options  -n  and  -N,  the  current  numerical
                     argument  will  be saved and then restored after the call
                     to  widget;  `-n  num'  sets   the   numerical   argument
                     temporarily  to  num,  while `-N' sets it to the default,
                     i.e. as if there were none.

                     With the option -K, keymap will be used  as  the  current
                     keymap  during the execution of the widget.  The previous
                     keymap will be restored when the widget exits.

                     Normally, calling a widget in this way does not  set  the
                     special  parameter WIDGET and related parameters, so that
                     the environment appears as if the top-level widget called
                     by  the  user  were  still  active.   With the option -w,
                     WIDGET and related parameters  are  set  to  reflect  the
                     widget being executed by the zle call.

                     Any  further arguments will be passed to the widget; note
                     that as standard  argument  handling  is  performed,  any
                     general argument list should be preceded by --.  If it is
                     a shell function, these are  passed  down  as  positional
                     parameters; for builtin widgets it is up to the widget in
                     question what it does with them.  Currently arguments are
                     only  handled  by  the  incremental-search  commands, the
                     history-search-forward    and    -backward    and     the
                     corresponding   functions   prefixed   by   vi-,  and  by
                     universal-argument.  No error is flagged if  the  command
                     does not use the arguments, or only uses some of them.

                     The  return status reflects the success or failure of the
                     operation carried out by  the  widget,  or  if  it  is  a
                     user-defined  widget  the  return  status  of  the  shell
                     function.

                     A non-zero return status causes the shell  to  beep  when
                     the  widget  exits,  unless the BEEP options was unset or
                     the widget was called via the zle  command.   Thus  if  a
                     user defined widget requires an immediate beep, it should
                     call the beep widget directly.

WIDGETS

       All actions in the editor are performed by `widgets'.  A  widget's  job
       is  simply  to  perform  some  small action.  The ZLE commands that key
       sequences in keymaps are bound to are in fact widgets.  Widgets can  be
       user-defined or built in.

       The  standard  widgets  built  into  ZLE are listed in Standard Widgets
       below.  Other built-in widgets can be defined  by  other  modules  (see
       zshmodules(1)).   Each  built-in  widget  has  two  names:  its  normal
       canonical name, and the same name preceded by a `.'.  The `.'  name  is
       special:  it  can't  be  rebound to a different widget.  This makes the
       widget available even when its usual name has been redefined.

       User-defined widgets are defined using `zle  -N',  and  implemented  as
       shell  functions.  When the widget is executed, the corresponding shell
       function is executed, and can perform editing (or other)  actions.   It
       is recommended that user-defined widgets should not have names starting
       with `.'.

USER-DEFINED WIDGETS

       User-defined widgets, being implemented as shell functions, can execute
       any  normal  shell  command.   They can also run other widgets (whether
       built-in or user-defined) using the zle builtin command.  The  standard
       input  of  the  function  is  closed  to prevent external commands from
       unintentionally blocking ZLE by reading from the terminal, but read  -k
       or  read  -q can be used to read characters.  Finally, they can examine
       and edit the ZLE buffer being edited by reading and setting the special
       parameters described below.

       These  special parameters are always available in widget functions, but
       are not in any way special outside ZLE.  If they have some normal value
       outside  ZLE,  that  value is temporarily inaccessible, but will return
       when the widget function exits.  These special parameters in fact  have
       local scope, like parameters created in a function using local.

       Inside  completion  widgets and traps called while ZLE is active, these
       parameters are available read-only.

       BUFFER (scalar)
              The entire contents of the edit buffer.  If it  is  written  to,
              the  cursor remains at the same offset, unless that would put it
              outside the buffer.

       BUFFERLINES (integer)
              The number of screen lines needed for the edit buffer  currently
              displayed  on  screen (i.e. without any changes to the preceding
              parameters done after the last redisplay); read-only.

       CONTEXT (scalar)
              The context in which zle was called to read a  line;  read-only.
              One of the values:
       start  The start of a command line (at prompt PS1).

       cont   A continuation to a command line (at prompt PS2).

       select In a select loop.

       vared  Editing a variable in vared.

       CURSOR (integer)
              The  offset  of  the cursor, within the edit buffer.  This is in
              the  range  0  to  $#BUFFER,  and  is  by  definition  equal  to
              $#LBUFFER.   Attempts to move the cursor outside the buffer will
              result in the cursor being moved to the appropriate end  of  the
              buffer.

       CUTBUFFER (scalar)
              The  last item cut using one of the `kill-' commands; the string
              which the next yank would insert in the line.  Later entries  in
              the  kill ring are in the array killring.  Note that the command
              `zle copy-region-as-kill string' can be used to set the text  of
              the  cut buffer from a shell function and cycle the kill ring in
              the same way as interactively killing text.

       HISTNO (integer)
              The current history number.  Setting this has the same effect as
              moving  up  or  down in the history to the corresponding history
              line.  An attempt to set it is ignored if the line is not stored
              in  the  history.   Note  this  is not the same as the parameter
              HISTCMD, which always gives the number of the history line being
              added  to  the  main shell's history.  HISTNO refers to the line
              being retrieved within zle.

       KEYMAP (scalar)
              The name of the currently selected keymap; read-only.

       KEYS (scalar)
              The keys typed to invoke  this  widget,  as  a  literal  string;
              read-only.

       killring (array)
              The  array  of  previously  killed items, with the most recently
              killed first.  This gives the items that would be retrieved by a
              yank-pop  in  the  same  order.   Note,  however,  that the most
              recently killed item is in $CUTBUFFER; $killring shows the array
              of previous entries.

              The  default size for the kill ring is eight, however the length
              may be changed by normal array operations.  Any empty string  in
              the kill ring is ignored by the yank-pop command, hence the size
              of the array effectively sets the maximum  length  of  the  kill
              ring,  while  the  number  of non-zero strings gives the current
              length, both as seen by the user at the command line.

       LASTABORTEDSEARCH (scalar)
              The last search string used by an interactive  search  that  was
              aborted by the user (status 3 returned by the search widget).

       LASTSEARCH (scalar)
              The last search string used by an interactive search; read-only.
              This is set even if the search failed (status 0, 1 or 2 returned
              by the search widget), but not if it was aborted by the user.

       LASTWIDGET (scalar)
              The name of the last widget that was executed; read-only.

       LBUFFER (scalar)
              The  part  of  the  buffer  that  lies to the left of the cursor
              position.  If it is assigned to, only that part of the buffer is
              replaced,  and  the  cursor remains between the new $LBUFFER and
              the old $RBUFFER.

       MARK (integer)
              Like CURSOR, but for the mark.

       NUMERIC (integer)
              The numeric argument. If no numeric  argument  was  given,  this
              parameter  is  unset. When this is set inside a widget function,
              builtin widgets called with the zle builtin command will use the
              value assigned. If it is unset inside a widget function, builtin
              widgets called behave as if no numeric argument was given.

       PENDING (integer)
              The number of bytes pending for input, i.e. the number of  bytes
              which  have  already  been typed and can immediately be read. On
              systems where the shell is not able  to  get  this  information,
              this parameter will always have a value of zero.  Read-only.

       PREBUFFER (scalar)
              In  a  multi-line  input at the secondary prompt, this read-only
              parameter contains the contents of the lines before the one  the
              cursor is currently in.

       PREDISPLAY (scalar)
              Text  to  be  displayed  before  the  start of the editable text
              buffer.  This does not have to be a complete line; to display  a
              complete  line, a newline must be appended explicitly.  The text
              is reset on each new invocation (but not  recursive  invocation)
              of zle.

       POSTDISPLAY (scalar)
              Text  to be displayed after the end of the editable text buffer.
              This does not have to be a complete line; to display a  complete
              line, a newline must be prepended explicitly.  The text is reset
              on each new invocation (but not recursive invocation) of zle.

       RBUFFER (scalar)
              The part of the buffer that lies to  the  right  of  the  cursor
              position.  If it is assigned to, only that part of the buffer is
              replaced, and the cursor remains between the  old  $LBUFFER  and
              the new $RBUFFER.

       REGION_ACTIVE (integer)
              Indicates if the region is currently active.  It can be assigned
              0 or 1 to deactivate and activate the region  respectively;  see
              Character Highlighting below.

       region_highlight (array)
              Each element of this array may be set to a string that describes
              highlighting for an arbitrary region of the  command  line  that
              will  take effect the next time the command line is redisplayed.
              Highlighting of the non-editable parts of the  command  line  in
              PREDISPLAY  and  POSTDISPLAY  are  possible, but note that the P
              flag is needed for character indexing to include PREDISPLAY.

              Each string consists of the following parts:

              Optionally, a `P' to signify that the start and end offset that
                     follow include any string set by the  PREDISPLAY  special
                     parameter; this is needed if the predisplay string itself
                     is to be highlighted.  Whitespace may follow the `P'.
              A start offset in the same units as CURSOR, terminated by
                     whitespace.
              An end offset in the same units as CURSOR, terminated by
                     whitespace.
              A highlight specification in the same format as
                     used for contexts in  the  parameter  zle_highlight,  see
                     Character  Highlighting  below;  for example, standout or
                     fg=red,bold.

              For example,

                     region_highlight=("P0 20 bold")

              specifies that the first twenty characters of the text including
              any predisplay string should be highlighted in bold.

              Note  that  the  effect  of  region_highlight  is  not saved and
              disappears as soon as the line is  accepted.   The  line  editor
              makes  no  attempt  to keep the highlighting effect synchronised
              with the line as it is edited; hence region highlighting is best
              limited to static effects within user widgets.

       WIDGET (scalar)
              The name of the widget currently being executed; read-only.

       WIDGETFUNC (scalar)
              The  name of the shell function that implements a widget defined
              with either zle -N or zle -C.  In the former case, this  is  the
              second  argument  to the zle -N command that defined the widget,
              or the first argument if there was no second argument.   In  the
              latter case this is the the third argument to the zle -C command
              that defined the widget.  Read-only.

       WIDGETSTYLE (scalar)
              Describes  the  implementation  behind  the  completion   widget
              currently  being executed; the second argument that followed zle
              -C when the widget was defined.  This is the name of  a  builtin
              completion  widget.  For widgets defined with zle -N this is set
              to the empty string.  Read-only.

       ZLE_STATE (scalar)
              Contains a  set  of  space-separated  words  that  describe  the
              current zle state.

              Currently, the only state shown is the insert mode as set by the
              overwrite-mode  or  vi-replace  widgets.   The  string  contains
              `insert'  if  characters to be inserted on the command line move
              existing characters to the right, `overwrite' if  characters  to
              be inserted overwrite existing characters.

   Special Widgets
       There  are  a  few user-defined widgets which are special to the shell.
       If they do not exist, no special  action  is  taken.   The  environment
       provided is identical to that for any other editing widget.

       zle-isearch-exit
              Executed at the end of incremental search at the point where the
              isearch   prompt   is   removed   from   the    display.     See
              zle-isearch-update for an example.

       zle-isearch-update
              Executed  within incremental search when the display is about to
              be redrawn.  Additional  output  below  the  incremental  search
              prompt  can  be  generated  by using `zle -M' within the widget.
              For example,

                     zle-isearch-update() { zle -M "Line $HISTNO"; }
                     zle -N zle-isearch-update

              Note the line output by `zle -M' is not  deleted  on  exit  from
              incremental  search.   This  can be done from a zle-isearch-exit
              widget:

                     zle-isearch-exit() { zle -M ""; }
                     zle -N zle-isearch-exit

       zle-line-init
              Executed every time the line editor is started  to  read  a  new
              line  of input.  The following example puts the line editor into
              vi command mode when it starts up.

                     zle-line-init() { zle -K vicmd; }
                     zle -N zle-line-init

              (The command inside the function sets the keymap directly; it is
              equivalent to zle vi-cmd-mode.)

       zle-line-finish
              This  is similar to zle-line-init but is executed every time the
              line editor has finished reading a line of input.

       zle-keymap-select
              Executed  every  time  the  keymap  changes,  i.e.  the  special
              parameter  KEYMAP  is  set  to a different value, while the line
              editor is active.  Initialising the keymap when the line  editor
              starts does not cause the widget to be called.

              The  value  $KEYMAP within the function reflects the new keymap.
              The old keymap is passed as the sole argument.

              This can be used for detecting switches between the  vi  command
              (vicmd) and insert (usually main) keymaps.

STANDARD WIDGETS

       The  following is a list of all the standard widgets, and their default
       bindings in emacs mode,  vi  command  mode  and  vi  insert  mode  (the
       `emacs', `vicmd' and `viins' keymaps, respectively).

       Note  that cursor keys are bound to movement keys in all three keymaps;
       the shell assumes that the cursor keys send the key sequences  reported
       by  the  terminal-handling  library  (termcap  or  terminfo).   The key
       sequences shown in the list are those based on  the  VT100,  common  on
       many modern terminals, but in fact these are not necessarily bound.  In
       the case of the viins keymap,  the  initial  escape  character  of  the
       sequences  serves  also  to  return  to  the vicmd keymap: whether this
       happens is determined by the KEYTIMEOUT parameter, see zshparam(1).

   Movement
       vi-backward-blank-word (unbound) (B) (unbound)
              Move backward one word, where a word is defined as a  series  of
              non-blank characters.

       backward-char (^B ESC-[D) (unbound) (unbound)
              Move backward one character.

       vi-backward-char (unbound) (^H h ^?) (ESC-[D)
              Move backward one character, without changing lines.

       backward-word (ESC-B ESC-b) (unbound) (unbound)
              Move to the beginning of the previous word.

       emacs-backward-word
              Move to the beginning of the previous word.

       vi-backward-word (unbound) (b) (unbound)
              Move to the beginning of the previous word, vi-style.

       beginning-of-line (^A) (unbound) (unbound)
              Move  to the beginning of the line.  If already at the beginning
              of the line, move to the beginning of the previous line, if any.

       vi-beginning-of-line
              Move to the beginning of the line, without changing lines.

       end-of-line (^E) (unbound) (unbound)
              Move to the end of the line.  If already at the end of the line,
              move to the end of the next line, if any.

       vi-end-of-line (unbound) ($) (unbound)
              Move  to  the  end of the line.  If an argument is given to this
              command, the cursor will  be  moved  to  the  end  of  the  line
              (argument - 1) lines down.

       vi-forward-blank-word (unbound) (W) (unbound)
              Move  forward  one  word, where a word is defined as a series of
              non-blank characters.

       vi-forward-blank-word-end (unbound) (E) (unbound)
              Move to the end of the current word, or, if at the  end  of  the
              current  word,  to  the  end  of  the next word, where a word is
              defined as a series of non-blank characters.

       forward-char (^F ESC-[C) (unbound) (unbound)
              Move forward one character.

       vi-forward-char (unbound) (space l) (ESC-[C)
              Move forward one character.

       vi-find-next-char (^X^F) (f) (unbound)
              Read a character  from  the  keyboard,  and  move  to  the  next
              occurrence of it in the line.

       vi-find-next-char-skip (unbound) (t) (unbound)
              Read  a  character  from  the keyboard, and move to the position
              just before the next occurrence of it in the line.

       vi-find-prev-char (unbound) (F) (unbound)
              Read a character from the keyboard, and  move  to  the  previous
              occurrence of it in the line.

       vi-find-prev-char-skip (unbound) (T) (unbound)
              Read  a  character  from  the keyboard, and move to the position
              just after the previous occurrence of it in the line.

       vi-first-non-blank (unbound) (^) (unbound)
              Move to the first non-blank character in the line.

       vi-forward-word (unbound) (w) (unbound)
              Move forward one word, vi-style.

       forward-word (ESC-F ESC-f) (unbound) (unbound)
              Move to the beginning of the next word.  The editor's idea of  a
              word is specified with the WORDCHARS parameter.

       emacs-forward-word
              Move to the end of the next word.

       vi-forward-word-end (unbound) (e) (unbound)
              Move to the end of the next word.

       vi-goto-column (ESC-|) (|) (unbound)
              Move to the column specified by the numeric argument.

       vi-goto-mark (unbound) (`) (unbound)
              Move to the specified mark.

       vi-goto-mark-line (unbound) (') (unbound)
              Move to beginning of the line containing the specified mark.

       vi-repeat-find (unbound) (;) (unbound)
              Repeat the last vi-find command.

       vi-rev-repeat-find (unbound) (,) (unbound)
              Repeat the last vi-find command in the opposite direction.

   History Control
       beginning-of-buffer-or-history (ESC-<) (unbound) (unbound)
              Move  to  the beginning of the buffer, or if already there, move
              to the first event in the history list.

       beginning-of-line-hist
              Move to the beginning of the line.  If already at the  beginning
              of the buffer, move to the previous history line.

       beginning-of-history
              Move to the first event in the history list.

       down-line-or-history (^N ESC-[B) (j) (ESC-[B)
              Move  down  a  line  in  the buffer, or if already at the bottom
              line, move to the next event in the history list.

       vi-down-line-or-history (unbound) (+) (unbound)
              Move down a line in the buffer, or  if  already  at  the  bottom
              line,  move to the next event in the history list.  Then move to
              the first non-blank character on the line.

       down-line-or-search
              Move down a line in the buffer, or  if  already  at  the  bottom
              line,  search  forward  in the history for a line beginning with
              the first word in the buffer.

              If called from a function by the zle command with arguments, the
              first  argument  is  taken  as  the  string for which to search,
              rather than the first word in the buffer.

       down-history (unbound) (^N) (unbound)
              Move to the next event in the history list.

       history-beginning-search-backward
              Search backward in the history for a  line  beginning  with  the
              current  line  up  to the cursor.  This leaves the cursor in its
              original position.

       end-of-buffer-or-history (ESC->) (unbound) (unbound)
              Move to the end of the buffer, or if already there, move to  the
              last event in the history list.

       end-of-line-hist
              Move  to  the  end  of  the  line.  If already at the end of the
              buffer, move to the next history line.

       end-of-history
              Move to the last event in the history list.

       vi-fetch-history (unbound) (G) (unbound)
              Fetch the history line specified by the numeric argument.   This
              defaults  to  the  current history line (i.e. the one that isn't
              history yet).

       history-incremental-search-backward (^R ^Xr) (unbound) (unbound)
              Search backward  incrementally  for  a  specified  string.   The
              search  is  case-insensitive  if the search string does not have
              uppercase letters and no numeric argument was given.  The string
              may  begin with `^' to anchor the search to the beginning of the
              line.  When called from  a  user-defined  function  returns  the
              following statuses: 0, if the search succeeded; 1, if the search
              failed; 2, if the search term was  a  bad  pattern;  3,  if  the
              search was aborted by the send-break command.

              A  restricted  set  of  editing  functions  is  available in the
              mini-buffer.  Keys are looked up in the special isearch  keymap,
              and  if not found there in the main keymap (note that by default
              the isearch keymap is empty).  An interrupt signal,  as  defined
              by  the  stty  setting,  will stop the search and go back to the
              original line.  An undefined key  will  have  the  same  effect.
              Note  that  the  following  always  perform the same task within
              incremental searches and cannot  be  replaced  by  user  defined
              widgets,  nor  can  the  set  of  functions  be  extended.   The
              supported functions are:

              accept-and-hold
              accept-and-infer-next-history
              accept-line
              accept-line-and-down-history
                     Perform the  usual  function  after  exiting  incremental
                     search.  The command line displayed is executed.

              backward-delete-char
              vi-backward-delete-char
                     Back  up  one place in the search history.  If the search
                     has been repeated  this  does  not  immediately  erase  a
                     character in the minibuffer.

              accept-search
                     Exit  incremental  search, retaining the command line but
                     performing no further action.  Note that this function is
                     not   bound   by   default  and  has  no  effect  outside
                     incremental search.

              backward-delete-word
              backward-kill-word
              vi-backward-kill-word
                     Back up one character  in  the  minibuffer;  if  multiple
                     searches  have  been  performed  since  the character was
                     inserted the search history is rewound to the point  just
                     before  the  character  was  entered.  Hence this has the
                     effect of repeating backward-delete-char.

              clear-screen
                     Clear the screen, remaining in incremental search mode.

              history-incremental-search-backward
                     Find  the  next  occurrence  of  the  contents   of   the
                     mini-buffer.

              history-incremental-search-forward
                     Invert the sense of the search.

              magic-space
                     Inserts a non-magical space.

              quoted-insert
              vi-quoted-insert
                     Quote the character to insert into the minibuffer.

              redisplay
                     Redisplay  the  command  line,  remaining  in incremental
                     search mode.

              vi-cmd-mode
                     Toggle between the `main' and `vicmd' keymaps; the `main'
                     keymap (insert mode) will be selected initially.

              vi-repeat-search
              vi-rev-repeat-search
                     Repeat  the  search.   The  direction  of  the  search is
                     indicated in the mini-buffer.

              Any character that is not bound to one of the  above  functions,
              or  self-insert or self-insert-unmeta, will cause the mode to be
              exited.  The character is then looked up  and  executed  in  the
              keymap in effect at that point.

              When  called  from  a  widget  function  by the zle command, the
              incremental search commands can take a  string  argument.   This
              will  be  treated  as  a string of keys, as for arguments to the
              bindkey command, and used as initial input for the command.  Any
              characters  in  the  string  which are unused by the incremental
              search will be silently ignored.  For example,

                     zle history-incremental-search-backward forceps

              will  search  backwards  for  forceps,  leaving  the  minibuffer
              containing the string `forceps'.

       history-incremental-search-forward (^S ^Xs) (unbound) (unbound)
              Search forward incrementally for a specified string.  The search
              is case-insensitive if the search string does not have uppercase
              letters and no numeric argument was given.  The string may begin
              with `^' to anchor the search to the beginning of the line.  The
              functions  available  in  the  mini-buffer  are  the same as for
              history-incremental-search-backward.

       history-incremental-pattern-search-backward
       history-incremental-pattern-search-forward
              These widgets behave similarly to the corresponding widgets with
              no  -pattern, but the search string typed by the user is treated
              as a pattern, respecting the current  settings  of  the  various
              options  affecting pattern matching.  See FILENAME GENERATION in
              zshexpn(1)  for  a  description  of  patterns.   If  no  numeric
              argument  was  given  lowercase letters in the search string may
              match uppercase letters in the history.  The  string  may  begin
              with `^' to anchor the search to the beginning of the line.

              The  prompt  changes  to  indicate  an invalid pattern; this may
              simply indicate the pattern is not yet complete.

              Note that only  non-overlapping  matches  are  reported,  so  an
              expression  with  wildcards  may  return fewer matches on a line
              than are visible by inspection.

       history-search-backward (ESC-P ESC-p) (unbound) (unbound)
              Search backward in the history for a  line  beginning  with  the
              first word in the buffer.

              If called from a function by the zle command with arguments, the
              first argument is taken as  the  string  for  which  to  search,
              rather than the first word in the buffer.

       vi-history-search-backward (unbound) (/) (unbound)
              Search  backward  in  the  history  for a specified string.  The
              string may begin with `^' to anchor the search to the  beginning
              of the line.

              A  restricted  set  of  editing  functions  is  available in the
              mini-buffer.  An  interrupt  signal,  as  defined  by  the  stty
              setting,   will stop the search.  The functions available in the
              mini-buffer     are:     accept-line,      backward-delete-char,
              vi-backward-delete-char,                     backward-kill-word,
              vi-backward-kill-word,  clear-screen,  redisplay,  quoted-insert
              and vi-quoted-insert.

              vi-cmd-mode  is treated the same as accept-line, and magic-space
              is treated as a space.  Any other character that is not bound to
              self-insert  or  self-insert-unmeta will beep and be ignored. If
              the function is called from vi command mode, the bindings of the
              current insert mode will be used.

              If called from a function by the zle command with arguments, the
              first argument is taken as  the  string  for  which  to  search,
              rather than the first word in the buffer.

       history-search-forward (ESC-N ESC-n) (unbound) (unbound)
              Search  forward  in  the  history  for a line beginning with the
              first word in the buffer.

              If called from a function by the zle command with arguments, the
              first  argument  is  taken  as  the  string for which to search,
              rather than the first word in the buffer.

       vi-history-search-forward (unbound) (?) (unbound)
              Search forward in the  history  for  a  specified  string.   The
              string  may begin with `^' to anchor the search to the beginning
              of the line. The functions available in the mini-buffer are  the
              same  as  for  vi-history-search-backward.  Argument handling is
              also the same as for that command.

       infer-next-history (^X^N) (unbound) (unbound)
              Search in the history list for a line matching the  current  one
              and fetch the event following it.

       insert-last-word (ESC-_ ESC-.) (unbound) (unbound)
              Insert  the  last  word  from  the previous history event at the
              cursor position.  If  a  positive  numeric  argument  is  given,
              insert that word from the end of the previous history event.  If
              the argument is zero or negative insert that word from the  left
              (zero  inserts  the  previous  command  word).   Repeating  this
              command replaces the word just inserted with the last word  from
              the  history event prior to the one just used; numeric arguments
              can be used in the same way to pick a word from that event.

              When called from a shell function invoked  from  a  user-defined
              widget,  the command can take one to three arguments.  The first
              argument specifies a history offset which applies to  successive
              calls  to  this  widget:  if  it is -1, the default behaviour is
              used, while if it is 1,  successive  calls  will  move  forwards
              through  the  history.  The value 0 can be used to indicate that
              the history line examined  by  the  previous  execution  of  the
              command  will  be reexamined.  Note that negative numbers should
              be preceded by a `--' argument  to  avoid  confusing  them  with
              options.

              If two arguments are given, the second specifies the word on the
              command line in normal array index notation (as a  more  natural
              alternative to the prefix argument).  Hence 1 is the first word,
              and -1 (the default) is the last word.

              If a third argument is given, its value is ignored,  but  it  is
              used  to  signify  that  the  history  offset is relative to the
              current history line, rather than the one remembered  after  the
              previous invocations of insert-last-word.

              For example, the default behaviour of the command corresponds to

                     zle insert-last-word -- -1 -1

              while the command

                     zle insert-last-word -- -1 1 -

              always  copies  the  first  word  of  the  line  in  the history
              immediately before the line being edited.   This  has  the  side
              effect  that later invocations of the widget will be relative to
              that line.

       vi-repeat-search (unbound) (n) (unbound)
              Repeat the last vi history search.

       vi-rev-repeat-search (unbound) (N) (unbound)
              Repeat the last vi history search, but in reverse.

       up-line-or-history (^P ESC-[A) (k) (ESC-[A)
              Move up a line in the buffer, or if already  at  the  top  line,
              move to the previous event in the history list.

       vi-up-line-or-history (unbound) (-) (unbound)
              Move  up  a  line  in the buffer, or if already at the top line,
              move to the previous event in the history list.   Then  move  to
              the first non-blank character on the line.

       up-line-or-search
              Move  up  a  line  in the buffer, or if already at the top line,
              search backward in the history for a  line  beginning  with  the
              first word in the buffer.

              If called from a function by the zle command with arguments, the
              first argument is taken as  the  string  for  which  to  search,
              rather than the first word in the buffer.

       up-history (unbound) (^P) (unbound)
              Move to the previous event in the history list.

       history-beginning-search-forward
              Search  forward  in  the  history  for a line beginning with the
              current line up to the cursor.  This leaves the  cursor  in  its
              original position.

   Modifying Text
       vi-add-eol (unbound) (A) (unbound)
              Move to the end of the line and enter insert mode.

       vi-add-next (unbound) (a) (unbound)
              Enter  insert  mode  after  the current cursor position, without
              changing lines.

       backward-delete-char (^H ^?) (unbound) (unbound)
              Delete the character behind the cursor.

       vi-backward-delete-char (unbound) (X) (^H)
              Delete the character behind the cursor, without changing  lines.
              If in insert mode, this won't delete past the point where insert
              mode was last entered.

       backward-delete-word
              Delete the word behind the cursor.

       backward-kill-line
              Kill from the beginning of the line to the cursor position.

       backward-kill-word (^W ESC-^H ESC-^?) (unbound) (unbound)
              Kill the word behind the cursor.

       vi-backward-kill-word (unbound) (unbound) (^W)
              Kill the word behind the cursor, without going  past  the  point
              where insert mode was last entered.

       capitalize-word (ESC-C ESC-c) (unbound) (unbound)
              Capitalize the current word and move past it.

       vi-change (unbound) (c) (unbound)
              Read  a  movement  command  from the keyboard, and kill from the
              cursor position to the endpoint of  the  movement.   Then  enter
              insert  mode.   If  the command is vi-change, change the current
              line.

       vi-change-eol (unbound) (C) (unbound)
              Kill to the end of the line and enter insert mode.

       vi-change-whole-line (unbound) (S) (unbound)
              Kill the current line and enter insert mode.

       copy-region-as-kill (ESC-W ESC-w) (unbound) (unbound)
              Copy the area from the cursor to the mark to the kill buffer.

              If  called  from  a  ZLE  widget  function  in  the  form   `zle
              copy-region-as-kill  string'  then  string  will be taken as the
              text to copy to the kill buffer.  The cursor, the mark  and  the
              text on the command line are not used in this case.

       copy-prev-word (ESC-^_) (unbound) (unbound)
              Duplicate the word to the left of the cursor.

       copy-prev-shell-word
              Like  copy-prev-word,  but  the  word  is  found  by using shell
              parsing, whereas copy-prev-word looks for blanks. This  makes  a
              difference when the word is quoted and contains spaces.

       vi-delete (unbound) (d) (unbound)
              Read  a  movement  command  from the keyboard, and kill from the
              cursor position to the endpoint of the movement.  If the command
              is vi-delete, kill the current line.

       delete-char
              Delete the character under the cursor.

       vi-delete-char (unbound) (x) (unbound)
              Delete  the  character  under the cursor, without going past the
              end of the line.

       delete-word
              Delete the current word.

       down-case-word (ESC-L ESC-l) (unbound) (unbound)
              Convert the current word to all lowercase and move past it.

       kill-word (ESC-D ESC-d) (unbound) (unbound)
              Kill the current word.

       gosmacs-transpose-chars
              Exchange the two characters behind the cursor.

       vi-indent (unbound) (>) (unbound)
              Indent a number of lines.

       vi-insert (unbound) (i) (unbound)
              Enter insert mode.

       vi-insert-bol (unbound) (I) (unbound)
              Move to the first non-blank character  on  the  line  and  enter
              insert mode.

       vi-join (^X^J) (J) (unbound)
              Join the current line with the next one.

       kill-line (^K) (unbound) (unbound)
              Kill  from the cursor to the end of the line.  If already on the
              end of the line, kill the newline character.

       vi-kill-line (unbound) (unbound) (^U)
              Kill from the cursor back  to  wherever  insert  mode  was  last
              entered.

       vi-kill-eol (unbound) (D) (unbound)
              Kill from the cursor to the end of the line.

       kill-region
              Kill from the cursor to the mark.

       kill-buffer (^X^K) (unbound) (unbound)
              Kill the entire buffer.

       kill-whole-line (^U) (unbound) (unbound)
              Kill the current line.

       vi-match-bracket (^X^B) (%) (unbound)
              Move to the bracket character (one of {}, () or []) that matches
              the one under the cursor.  If the cursor is  not  on  a  bracket
              character,  move  forward without going past the end of the line
              to find one, and then go to the matching bracket.

       vi-open-line-above (unbound) (O) (unbound)
              Open a line above the cursor and enter insert mode.

       vi-open-line-below (unbound) (o) (unbound)
              Open a line below the cursor and enter insert mode.

       vi-oper-swap-case
              Read a movement command from the keyboard, and swap the case  of
              all  characters  from the cursor position to the endpoint of the
              movement.  If the movement command  is  vi-oper-swap-case,  swap
              the case of all characters on the current line.

       overwrite-mode (^X^O) (unbound) (unbound)
              Toggle between overwrite mode and insert mode.

       vi-put-before (unbound) (P) (unbound)
              Insert  the  contents  of the kill buffer before the cursor.  If
              the kill buffer contains a sequence  of  lines  (as  opposed  to
              characters), paste it above the current line.

       vi-put-after (unbound) (p) (unbound)
              Insert the contents of the kill buffer after the cursor.  If the
              kill  buffer  contains  a  sequence  of  lines  (as  opposed  to
              characters), paste it below the current line.

       quoted-insert (^V) (unbound) (unbound)
              Insert  the  next character typed into the buffer literally.  An
              interrupt character will not be inserted.

       vi-quoted-insert (unbound) (unbound) (^Q ^V)
              Display a `^' at  the  cursor  position,  and  insert  the  next
              character   typed  into  the  buffer  literally.   An  interrupt
              character will not be inserted.

       quote-line (ESC-') (unbound) (unbound)
              Quote the current line; that is, put  a  `''  character  at  the
              beginning and the end, and convert all `'' characters to `'\'''.

       quote-region (ESC-") (unbound) (unbound)
              Quote the region from the cursor to the mark.

       vi-replace (unbound) (R) (unbound)
              Enter overwrite mode.

       vi-repeat-change (unbound) (.) (unbound)
              Repeat  the last vi mode text modification.  If a count was used
              with the modification, it is remembered.  If a count is given to
              this   command,  it  overrides  the  remembered  count,  and  is
              remembered for future uses of  this  command.   The  cut  buffer
              specification is similarly remembered.

       vi-replace-chars (unbound) (r) (unbound)
              Replace  the  character  under  the cursor with a character read
              from the keyboard.

       self-insert (printable characters) (unbound) (printable characters  and
       some control characters)
              Insert a character into the buffer at the cursor position.

       self-insert-unmeta (ESC-^I ESC-^J ESC-^M) (unbound) (unbound)
              Insert  a character into the buffer after stripping the meta bit
              and converting ^M to ^J.

       vi-substitute (unbound) (s) (unbound)
              Substitute the next character(s).

       vi-swap-case (unbound) (~) (unbound)
              Swap the case of the character under the cursor  and  move  past
              it.

       transpose-chars (^T) (unbound) (unbound)
              Exchange  the two characters to the left of the cursor if at end
              of line, else exchange the character under the cursor  with  the
              character to the left.

       transpose-words (ESC-T ESC-t) (unbound) (unbound)
              Exchange the current word with the one before it.

       vi-unindent (unbound) (<) (unbound)
              Unindent a number of lines.

       up-case-word (ESC-U ESC-u) (unbound) (unbound)
              Convert the current word to all caps and move past it.

       yank (^Y) (unbound) (unbound)
              Insert the contents of the kill buffer at the cursor position.

       yank-pop (ESC-y) (unbound) (unbound)
              Remove  the  text just yanked, rotate the kill-ring (the history
              of previously killed text) and yank the  new  top.   Only  works
              following yank or yank-pop.

       vi-yank (unbound) (y) (unbound)
              Read  a  movement command from the keyboard, and copy the region
              from the cursor position to the endpoint of  the  movement  into
              the  kill  buffer.   If the command is vi-yank, copy the current
              line.

       vi-yank-whole-line (unbound) (Y) (unbound)
              Copy the current line into the kill buffer.

       vi-yank-eol
              Copy the region from the cursor position to the end of the  line
              into the kill buffer.  Arguably, this is what Y should do in vi,
              but it isn't what it actually does.

   Arguments
       digit-argument (ESC-0..ESC-9) (1-9) (unbound)
              Start a new numeric argument, or add to the  current  one.   See
              also vi-digit-or-beginning-of-line.  This only works if bound to
              a key sequence ending in a decimal digit.

              Inside a widget function, a call to  this  function  treats  the
              last  key  of  the  key  sequence which called the widget as the
              digit.

       neg-argument (ESC--) (unbound) (unbound)
              Changes the sign of the following argument.

       universal-argument
              Multiply the argument of the next command by 4.   Alternatively,
              if   this  command  is  followed  by  an  integer  (positive  or
              negative), use that as the argument for the next command.   Thus
              digits  cannot  be repeated using this command.  For example, if
              this command occurs twice, followed immediately by forward-char,
              move  forward  sixteen  spaces; if instead it is followed by -2,
              then forward-char, move backward two spaces.

              Inside a widget function,  if  passed  an  argument,  i.e.  `zle
              universal-argument  num',  the numerical argument will be set to
              num; this is equivalent to `NUMERIC=num'.

       argument-base
              Use the existing numeric argument as a numeric base, which  must
              be   in  the  range  2  to  36  inclusive.   Subsequent  use  of
              digit-argument and universal-argument will input a new prefix in
              the  given  base.  The usual hexadecimal convention is used: the
              letter a or A corresponds to 10, and so on.  Arguments in  bases
              requiring  digits  from  10  upwards are more conveniently input
              with universal-argument, since ESC-a etc. are not usually  bound
              to digit-argument.

              The  function  can  be  used  with  a  command argument inside a
              user-defined widget.  The following code sets the base to 16 and
              lets  the  user  input a hexadecimal argument until a key out of
              the digit range is typed:

                     zle argument-base 16
                     zle universal-argument

   Completion
       accept-and-menu-complete
              In a menu completion, insert the  current  completion  into  the
              buffer, and advance to the next possible completion.

       complete-word
              Attempt completion on the current word.

       delete-char-or-list (^D) (unbound) (unbound)
              Delete  the character under the cursor.  If the cursor is at the
              end of the line, list possible completions for the current word.

       expand-cmd-path
              Expand the current command to its full pathname.

       expand-or-complete (TAB) (unbound) (TAB)
              Attempt shell expansion on the current  word.   If  that  fails,
              attempt completion.

       expand-or-complete-prefix
              Attempt shell expansion on the current word up to cursor.

       expand-history (ESC-space ESC-!) (unbound) (unbound)
              Perform history expansion on the edit buffer.

       expand-word (^X*) (unbound) (unbound)
              Attempt shell expansion on the current word.

       list-choices (ESC-^D) (^D =) (^D)
              List possible completions for the current word.

       list-expand (^Xg ^XG) (^G) (^G)
              List the expansion of the current word.

       magic-space
              Perform  history  expansion  and insert a space into the buffer.
              This is intended to be bound to space.

       menu-complete
              Like complete-word, except that menu completion  is  used.   See
              the MENU_COMPLETE option.

       menu-expand-or-complete
              Like expand-or-complete, except that menu completion is used.

       reverse-menu-complete
              Perform  menu  completion,  like menu-complete, except that if a
              menu completion is already in progress,  move  to  the  previous
              completion rather than the next.

       end-of-list
              When  a  previous  completion displayed a list below the prompt,
              this widget can be used to move the prompt below the list.

   Miscellaneous
       accept-and-hold (ESC-A ESC-a) (unbound) (unbound)
              Push the contents of the buffer on the buffer stack and  execute
              it.

       accept-and-infer-next-history
              Execute  the  contents  of  the buffer.  Then search the history
              list for a line matching the current  one  and  push  the  event
              following onto the buffer stack.

       accept-line (^J ^M) (^J ^M) (^J ^M)
              Finish  editing  the buffer.  Normally this causes the buffer to
              be executed as a shell command.

       accept-line-and-down-history (^O) (unbound) (unbound)
              Execute the current line, and push the next history event on the
              the buffer stack.

       auto-suffix-remove
              If  the  previous  action added a suffix (space, slash, etc.) to
              the word on the command line, remove it.  Otherwise do  nothing.
              Removing  the  suffix  ends  any  active menu completion or menu
              selection.

              This widget is intended to be called from  user-defined  widgets
              to enforce a desired suffix-removal behavior.

       auto-suffix-retain
              If  the  previous  action added a suffix (space, slash, etc.) to
              the word  on  the  command  line,  force  it  to  be  preserved.
              Otherwise do nothing.  Retaining the suffix ends any active menu
              completion or menu selection.

              This widget is intended to be called from  user-defined  widgets
              to enforce a desired suffix-preservation behavior.

       beep   Beep, unless the BEEP option is unset.

       vi-cmd-mode (^X^V) (unbound) (^[)
              Enter  command  mode;  that is, select the `vicmd' keymap.  Yes,
              this is bound by default in emacs mode.

       vi-caps-lock-panic
              Hang until any lowercase key is pressed.  This is for  vi  users
              without the mental capacity to keep track of their caps lock key
              (like the author).

       clear-screen (^L ESC-^L) (^L) (^L)
              Clear the screen and redraw the prompt.

       describe-key-briefly
              Reads a key sequence, then prints the  function  bound  to  that
              sequence.

       exchange-point-and-mark (^X^X) (unbound) (unbound)
              Exchange  the  cursor  position (point) with the position of the
              mark.  Unless a negative prefix argument is  given,  the  region
              between   point  and  mark  is  activated  so  that  it  can  be
              highlighted.  If a zero prefix argument is given, the region  is
              activated but point and mark are not swapped.

       execute-named-cmd (ESC-x) (:) (unbound)
              Read the name of an editor command and execute it.  A restricted
              set of editing functions is available in the mini-buffer.   Keys
              are  looked  up  in the special command keymap, and if not found
              there in the main keymap.  An interrupt signal,  as  defined  by
              the  stty  setting,  will  abort  the  function.   Note that the
              following   always   perform   the   same   task   within    the
              executed-named-cmd  environment  and  cannot be replaced by user
              defined widgets, nor can the set of functions be extended.   The
              allowed        functions        are:       backward-delete-char,
              vi-backward-delete-char, clear-screen, redisplay, quoted-insert,
              vi-quoted-insert,   backward-kill-word,   vi-backward-kill-word,
              kill-whole-line, vi-kill-line, backward-kill-line, list-choices,
              delete-char-or-list,         complete-word,         accept-line,
              expand-or-complete and expand-or-complete-prefix.

              kill-region kills the last word, and vi-cmd-mode is treated  the
              same as accept-line.  The space and tab characters, if not bound
              to one of these functions, will complete the name and then  list
              the  possibilities  if  the  AUTO_LIST option is set.  Any other
              character that is not bound to self-insert or self-insert-unmeta
              will  beep  and  be ignored.  The bindings of the current insert
              mode will be used.

              Currently this command may not be redefined or called by name.

       execute-last-named-cmd (ESC-z) (unbound) (unbound)
              Redo the last function executed with execute-named-cmd.

              Currently this command may not be redefined or called by name.

       get-line (ESC-G ESC-g) (unbound) (unbound)
              Pop the top line off the buffer  stack  and  insert  it  at  the
              cursor position.

       pound-insert (unbound) (#) (unbound)
              If  there  is no # character at the beginning of the buffer, add
              one to the beginning of each line.  If there is one, remove a  #
              from each line that has one.  In either case, accept the current
              line.  The INTERACTIVE_COMMENTS option must be set for  this  to
              have any usefulness.

       vi-pound-insert
              If there is no # character at the beginning of the current line,
              add one.  If there is one, remove it.  The  INTERACTIVE_COMMENTS
              option must be set for this to have any usefulness.

       push-input
              Push  the  entire  current  multiline  construct onto the buffer
              stack and return to the top-level (PS1) prompt.  If the  current
              parser  construct  is  only  a single line, this is exactly like
              push-line.  Next time the editor starts up  or  is  popped  with
              get-line, the construct will be popped off the top of the buffer
              stack and loaded into the editing buffer.

       push-line (^Q ESC-Q ESC-q) (unbound) (unbound)
              Push the current buffer onto the  buffer  stack  and  clear  the
              buffer.   Next  time  the  editor  starts up, the buffer will be
              popped off the top of the  buffer  stack  and  loaded  into  the
              editing buffer.

       push-line-or-edit
              At  the  top-level  (PS1) prompt, equivalent to push-line.  At a
              secondary  (PS2)  prompt,  move  the  entire  current  multiline
              construct  into  the editor buffer.  The latter is equivalent to
              push-input followed by get-line.

       read-command
              Only useful from a user-defined widget.   A  keystroke  is  read
              just  as  in  normal operation, but instead of the command being
              executed the name of the  command  that  would  be  executed  is
              stored  in  the  shell parameter REPLY.  This can be used as the
              argument of a future zle command.  If the key  sequence  is  not
              bound, status 1 is returned; typically, however, REPLY is set to
              undefined-key to indicate a useless key sequence.

       recursive-edit
              Only useful from a user-defined widget.  At this  point  in  the
              function,  the  editor regains control until one of the standard
              widgets which would normally cause zle  to  exit  (typically  an
              accept-line  caused  by  hitting  the  return  key) is executed.
              Instead, control returns to the user-defined widget.  The status
              returned  is  non-zero if the return was caused by an error, but
              the function still continues executing and hence  may  tidy  up.
              This  makes  it  safe  for  the user-defined widget to alter the
              command line or key bindings temporarily.

              The following widget, caps-lock, serves as an example.
                     self-insert-ucase() {
                       LBUFFER+=${(U)KEYS[-1]}
                     }

                     integer stat

                     zle -N self-insert self-insert-ucase
                     zle -A caps-lock save-caps-lock
                     zle -A accept-line caps-lock

                     zle recursive-edit
                     stat=$?

                     zle -A .self-insert self-insert
                     zle -A save-caps-lock caps-lock
                     zle -D save-caps-lock

                     (( stat )) && zle send-break

                     return $stat
              This causes typed  letters  to  be  inserted  capitalised  until
              either  accept-line  (i.e. typically the return key) is typed or
              the caps-lock widget is invoked again; the later is  handled  by
              saving  the  old  definition  of caps-lock as save-caps-lock and
              then rebinding it to invoke accept-line.   Note  that  an  error
              from  the recursive edit is detected as a non-zero return status
              and propagated by using the send-break widget.

       redisplay (unbound) (^R) (^R)
              Redisplays the edit buffer.

       reset-prompt (unbound) (unbound) (unbound)
              Force the prompts on both the left and right of the screen to be
              re-expanded,  then  redisplay  the  edit  buffer.  This reflects
              changes both to the prompt variables themselves and  changes  in
              the  expansion  of  the  values (for example, changes in time or
              directory, or changes to the value of variables referred  to  by
              the prompt).

              Otherwise, the prompt is only expanded each time zle starts, and
              when the display as been interrupted by output from another part
              of  the  shell  (such  as  a  job notification) which causes the
              command line to be reprinted.

       send-break (^G ESC-^G) (unbound) (unbound)
              Abort the current editor function,  e.g.  execute-named-command,
              or  the editor itself, e.g. if you are in vared. Otherwise abort
              the parsing of the current line; in this case the  aborted  line
              is available in the shell variable ZLE_LINE_ABORTED.

       run-help (ESC-H ESC-h) (unbound) (unbound)
              Push  the  buffer onto the buffer stack, and execute the command
              `run-help cmd', where cmd is the current command.   run-help  is
              normally aliased to man.

       vi-set-buffer (unbound) (") (unbound)
              Specify a buffer to be used in the following command.  There are
              35 buffers that can be specified: the 26 `named' buffers  "a  to
              "z  and  the  nine `queued' buffers "1 to "9.  The named buffers
              can also be specified as "A to "Z.

              When a buffer is specified for a cut command, the text being cut
              replaces  the  previous  contents of the specified buffer.  If a
              named buffer is specified using a capital, the newly cut text is
              appended to the buffer instead of overwriting it.

              If no buffer is specified for a cut command, "1 is used, and the
              contents of "1 to "8 are each  shifted  along  one  buffer;  the
              contents of "9 is lost.

       vi-set-mark (unbound) (m) (unbound)
              Set the specified mark at the cursor position.

       set-mark-command (^@) (unbound) (unbound)
              Set  the mark at the cursor position.  If called with a negative
              prefix argument, do not set the mark but deactivate  the  region
              so  that  it  is  no  longer highlighted (it is still usable for
              other purposes).  Otherwise the region is marked as active.

       spell-word (ESC-$ ESC-S ESC-s) (unbound) (unbound)
              Attempt spelling correction on the current word.

       undefined-key
              This command is executed when a key sequence that is  not  bound
              to any command is typed.  By default it beeps.

       undo (^_ ^Xu ^X^U) (unbound) (unbound)
              Incrementally undo the last text modification.

       redo   Incrementally redo undone text modifications.

       vi-undo-change (unbound) (u) (unbound)
              Undo   the  last  text  modification.   If  repeated,  redo  the
              modification.

       what-cursor-position (^X=) (unbound) (unbound)
              Print the character under the cursor,  its  code  as  an  octal,
              decimal  and  hexadecimal  number,  the  current cursor position
              within the buffer and the column of the cursor  in  the  current
              line.

       where-is
              Read  the name of an editor command and and print the listing of
              key sequences that invoke the specified command.   A  restricted
              set  of editing functions is available in the mini-buffer.  Keys
              are looked up in the special command keymap, and  if  not  found
              there in the main keymap.

       which-command (ESC-?) (unbound) (unbound)
              Push  the  buffer onto the buffer stack, and execute the command
              `which-command  cmd'.  where  cmd  is   the   current   command.
              which-command is normally aliased to whence.

       vi-digit-or-beginning-of-line (unbound) (0) (unbound)
              If the last command executed was a digit as part of an argument,
              continue the argument.  Otherwise, execute vi-beginning-of-line.

CHARACTER HIGHLIGHTING

       The line editor has the ability to highlight characters or  regions  of
       the  line  that  have a particular significance.  This is controlled by
       the array parameter zle_highlight, if it has been set by the user.

       If the parameter contains the single entry  none  all  highlighting  is
       turned off.  Note the parameter is still expected to be an array.

       Otherwise each entry of the array should consist of a word indicating a
       context for highlighting, then a colon, then a comma-separated list  of
       the types of highlighting to apply in that context.

       The contexts available for highlighting are the following:

       default
              Any  text  within  the  command  line  not affected by any other
              highlighting.  Text outside the editable  area  of  the  command
              line is not affected.

       isearch
              When  one  of  the incremental history search widgets is active,
              the area of the command line matched by  the  search  string  or
              pattern.

       region The  region  between the cursor (point) and the mark as set with
              set-mark-command.  The region  is  only  highlighted  if  it  is
              active,    which    is   the   case   if   set-mark-command   or
              exchange-point-and-mark has been called and  the  line  has  not
              been  subsequently  modified.   The region can be deactivated by
              calling set-mark-command with a  negative  prefix  argument,  or
              reactivated  by  calling  exchange-point-and-mark  with  a  zero
              prefix argument.  Note that whether or not the region is  active
              has  no  effect  on its use within widgets, it simply determines
              whether it is highlighted.

       special
              Individual   characters   that   have   no   direct    printable
              representation  but  are  shown  in a special manner by the line
              editor.  These characters are described below.

       suffix This context is used  in  completion  for  characters  that  are
              marked  as  suffixes that will be removed if the completion ends
              at that point, the most obvious example being a slash (/)  after
              a directory name.  Note that suffix removal is configurable; the
              circumstances under which the suffix will be removed may  differ
              for different completions.

       zle_highlight   may  contain  additional  fields  for  controlling  how
       terminal sequences to change colours are output.  Each of the following
       is  followed  by  a  colon  and  a  string  in the same form as for key
       bindings.  This  will  not  be  necessary  for  the  vast  majority  of
       terminals as the defaults shown in parentheses are widely used.

       fg_start_code (\e[3)
              The  start  of  the  escape  sequence for the foreground colour.
              This is followed by an ASCII digit representing the colour.

       fg_default_code (9)
              The number to use instead of the colour  to  reset  the  default
              foreground colour.

       fg_end_code (m)
              The end of the escape sequence for the foreground colour.

       bg_start_code (\e[4)
              The  start  of  the  escape  sequence for the background colour.
              This is followed by an ASCII digit representing the colour.

       bg_default_code (9)
              The number to use instead of the colour  to  reset  the  default
              background colour.

       bg_end_code (m)
              The end of the escape sequence for the background colour.

       The  available  types of highlighting are the following.  Note that not
       all types of highlighting are available on all terminals:

       none   No highlighting is applied to the  given  context.   It  is  not
              useful  for  this to appear with other types of highlighting; it
              is used to override a default.

       fg=colour
              The foreground colour should be set to colour, a decimal integer
              or the name of one of the eight most widely-supported colours.

              Not  all  terminals  support this and, of those that do, not all
              provide facilities to test the support, hence  the  user  should
              decide  based  on the terminal type.  Most terminals support the
              colours black, red,  green,  yellow,  blue,  magenta,  cyan  and
              white,  which  can  be set by name.  In addition. default may be
              used  to  set  the   terminal's   default   foreground   colour.
              Abbreviations   are  allowed;  b  or  bl  selects  black.   Some
              terminals may generate additional colours if the bold  attribute
              is also present.

              On  recent  terminals and on systems with an up-to-date terminal
              database the number of colours supported may be  tested  by  the
              command  `echotc  Co'; if this succeeds, it indicates a limit on
              the number of colours which will be enforced by the line editor.
              The  number  of  colours is in any case limited to 256 (i.e. the
              range 0 to 255).

              Colour is also known as color.

       bg=colour
              The background colour should  be  set  to  colour.   This  works
              similarly to the foreground colour, except the background is not
              usually affected by the bold attribute.

       bold   The characters in the given context are shown in  a  bold  font.
              Not all terminals distinguish bold fonts.

       standout
              The  characters in the given context are shown in the terminal's
              standout mode.  The actual effect is specific to  the  terminal;
              on  many terminals it is inverse video.  On some such terminals,
              where the cursor does not blink it appears  with  standout  mode
              negated, making it less than clear where the cursor actually is.
              On such terminals one of the other effects may be preferable for
              highlighting the region and matched search string.

       underline
              The  characters in the given context are shown underlined.  Some
              terminals show the foreground in a different colour instead;  in
              this case whitespace will not be highlighted.

       The  characters  described  above  as  `special'  are  as follows.  The
       formatting  described  here  is  used  irrespective  of   whether   the
       characters are highlighted:

       ASCII control characters
              Control  characters in the ASCII range are shown as `^' followed
              by the base character.

       Unprintable multibyte characters
              This item applies to control characters not in the ASCII  range,
              plus other characters as follows.  If the MULTIBYTE option is in
              effect, multibyte characters not in the ASCII character set that
              are  reported  as  having  zero  width  are treated as combining
              characters when the option COMBINING_CHARS is on.  If the option
              is off, or if a character appears where a combining character is
              not valid, the character is treated as unprintable.

              Unprintable multibyte characters  are  shown  as  a  hexadecimal
              number  between angle brackets.  The number is the code point of
              the character in the wide character set; this may or may not  be
              Unicode, depending on the operating system.

       Invalid multibyte characters
              If  the  MULTIBYTE  option  is in effect, any sequence of one or
              more bytes that does not form a valid character in  the  current
              character  set  is  treated as a series of bytes each shown as a
              special character.  This case can be  distinguished  from  other
              unprintable  characters  as  the  bytes  are  represented as two
              hexadecimal digits between angle brackets, as distinct from  the
              four  or  eight  digits that are used for unprintable characters
              that are nonetheless valid in the current character set.

              Not all systems support this:  for  it  to  work,  the  system's
              representation  of  wide characters must be code values from the
              Universal Character Set, as defined by IS0 10646 (also known  as
              Unicode).

       If  zle_highlight  is  not  set  or  no  value  applies to a particular
       context, the defaults applied are equivalent to

              zle_highlight=(region:standout special:standout
              suffix:bold isearch:underline)

       i.e. both the region and special characters are shown in standout mode.

       Within widgets, arbitrary regions may be  highlighted  by  setting  the
       special array parameter region_highlight; see above.