Provided by: less_551-1_amd64 bug

NAME

       less - opposite of more

SYNOPSIS

       less -?
       less --help
       less -V
       less --version
       less [-[+]aABcCdeEfFgGiIJKLmMnNqQrRsSuUVwWX~]
            [-b space] [-h lines] [-j line] [-k keyfile]
            [-{oO} logfile] [-p pattern] [-P prompt] [-t tag]
            [-T tagsfile] [-x tab,...] [-y lines] [-[z] lines]
            [-# shift] [+[+]cmd] [--] [filename]...
       (See the OPTIONS section for alternate option syntax with long option names.)

DESCRIPTION

       Less  is a program similar to more (1), but it has many more features.  Less does not have
       to read the entire input file before starting, so with large  input  files  it  starts  up
       faster than text editors like vi (1).  Less uses termcap (or terminfo on some systems), so
       it can run on a variety  of  terminals.   There  is  even  limited  support  for  hardcopy
       terminals.   (On  a  hardcopy  terminal,  lines  which should be printed at the top of the
       screen are prefixed with a caret.)

       Commands are based on both more and vi.  Commands may be preceded  by  a  decimal  number,
       called N in the descriptions below.  The number is used by some commands, as indicated.

COMMANDS

       In  the  following  descriptions,  ^X means control-X.  ESC stands for the ESCAPE key; for
       example ESC-v means the two character sequence "ESCAPE", then "v".

       h or H Help: display a summary of these commands.  If you forget all the  other  commands,
              remember this one.

       SPACE or ^V or f or ^F
              Scroll  forward  N  lines,  default one window (see option -z below).  If N is more
              than the screen size, only the final screenful is displayed.  Warning: some systems
              use ^V as a special literalization character.

       z      Like SPACE, but if N is specified, it becomes the new window size.

       ESC-SPACE
              Like  SPACE,  but  scrolls  a full screenful, even if it reaches end-of-file in the
              process.

       ENTER or RETURN or ^N or e or ^E or j or ^J
              Scroll forward N lines, default 1.  The entire N lines are displayed, even if N  is
              more than the screen size.

       d or ^D
              Scroll forward N lines, default one half of the screen size.  If N is specified, it
              becomes the new default for subsequent d and u commands.

       b or ^B or ESC-v
              Scroll backward N lines, default one window (see option -z below).  If  N  is  more
              than the screen size, only the final screenful is displayed.

       w      Like ESC-v, but if N is specified, it becomes the new window size.

       y or ^Y or ^P or k or ^K
              Scroll backward N lines, default 1.  The entire N lines are displayed, even if N is
              more than the screen size.  Warning: some systems use ^Y as a special  job  control
              character.

       u or ^U
              Scroll  backward  N lines, default one half of the screen size.  If N is specified,
              it becomes the new default for subsequent d and u commands.

       J      Like j, but continues to scroll beyond the end of the file.

       K or Y Like k, but continues to scroll beyond the beginning of the file.

       ESC-) or RIGHTARROW
              Scroll horizontally right N characters, default half the screen width (see  the  -#
              option).   If a number N is specified, it becomes the default for future RIGHTARROW
              and LEFTARROW commands.  While the text is scrolled,  it  acts  as  though  the  -S
              option (chop lines) were in effect.

       ESC-( or LEFTARROW
              Scroll  horizontally  left  N characters, default half the screen width (see the -#
              option).  If a number N is specified, it becomes the default for future  RIGHTARROW
              and LEFTARROW commands.

       ESC-} or ^RIGHTARROW
              Scroll horizontally right to show the end of the longest displayed line.

       ESC-{ or ^LEFTARROW
              Scroll horizontally left back to the first column.

       r or ^R or ^L
              Repaint the screen.

       R      Repaint  the screen, discarding any buffered input.  Useful if the file is changing
              while it is being viewed.

       F      Scroll forward, and keep trying to read when the end of file is reached.   Normally
              this  command  would  be  used when already at the end of the file.  It is a way to
              monitor the tail of a file which  is  growing  while  it  is  being  viewed.   (The
              behavior is similar to the "tail -f" command.)

       ESC-F  Like  F,  but as soon as a line is found which matches the last search pattern, the
              terminal bell is rung and forward scrolling stops.

       g or < or ESC-<
              Go to line N in the file, default 1 (beginning of file).   (Warning:  this  may  be
              slow if N is large.)

       G or > or ESC->
              Go  to line N in the file, default the end of the file.  (Warning: this may be slow
              if N is large, or if N is not specified and standard input, rather than a file,  is
              being read.)

       ESC-G  Same as G, except if no number N is specified and the input is standard input, goes
              to the last line which is currently buffered.

       p or % Go to a position N percent into the file.  N should be between 0 and 100,  and  may
              contain a decimal point.

       P      Go to the line containing byte offset N in the file.

       {      If  a  left  curly  bracket  appears in the top line displayed on the screen, the {
              command will go to the matching right curly  bracket.   The  matching  right  curly
              bracket  is positioned on the bottom line of the screen.  If there is more than one
              left curly bracket on the top line, a number N may be  used  to  specify  the  N-th
              bracket on the line.

       }      If  a right curly bracket appears in the bottom line displayed on the screen, the }
              command will go to the matching  left  curly  bracket.   The  matching  left  curly
              bracket  is  positioned  on  the top line of the screen.  If there is more than one
              right curly bracket on the top line, a number N may be used  to  specify  the  N-th
              bracket on the line.

       (      Like {, but applies to parentheses rather than curly brackets.

       )      Like }, but applies to parentheses rather than curly brackets.

       [      Like {, but applies to square brackets rather than curly brackets.

       ]      Like }, but applies to square brackets rather than curly brackets.

       ESC-^F Followed  by  two  characters, acts like {, but uses the two characters as open and
              close brackets, respectively.  For example, "ESC ^F  <  >"  could  be  used  to  go
              forward to the > which matches the < in the top displayed line.

       ESC-^B Followed  by  two  characters, acts like }, but uses the two characters as open and
              close brackets, respectively.  For example, "ESC ^B  <  >"  could  be  used  to  go
              backward to the < which matches the > in the bottom displayed line.

       m      Followed  by any lowercase or uppercase letter, marks the first displayed line with
              that letter.  If the status column is enabled via the -J option, the status  column
              shows the marked line.

       M      Acts  like  m,  except  the  last  displayed  line  is marked rather than the first
              displayed line.

       '      (Single quote.)  Followed by any lowercase or  uppercase  letter,  returns  to  the
              position  which was previously marked with that letter.  Followed by another single
              quote, returns to the position at which  the  last  "large"  movement  command  was
              executed.   Followed  by  a  ^  or  $,  jumps  to  the beginning or end of the file
              respectively.  Marks are preserved when a new file is examined, so  the  '  command
              can be used to switch between input files.

       ^X^X   Same as single quote.

       ESC-m  Followed  by  any lowercase or uppercase letter, clears the mark identified by that
              letter.

       /pattern
              Search forward in the file for the N-th line containing the pattern.  N defaults to
              1.   The  pattern  is a regular expression, as recognized by the regular expression
              library supplied by your system.  The search starts at  the  first  line  displayed
              (but see the -a and -j options, which change this).

              Certain  characters  are  special  if entered at the beginning of the pattern; they
              modify the type of search rather than become part of the pattern:

              ^N or !
                     Search for lines which do NOT match the pattern.

              ^E or *
                     Search multiple files.  That is, if  the  search  reaches  the  END  of  the
                     current  file without finding a match, the search continues in the next file
                     in the command line list.

              ^F or @
                     Begin the search at the first line of the FIRST file  in  the  command  line
                     list,  regardless  of  what  is  currently  displayed  on  the screen or the
                     settings of the -a or -j options.

              ^K     Highlight any text which matches the pattern  on  the  current  screen,  but
                     don't move to the first match (KEEP current position).

              ^R     Don't  interpret  regular  expression  metacharacters;  that is, do a simple
                     textual comparison.

       ?pattern
              Search backward in the file for the N-th line containing the pattern.   The  search
              starts  at  the  last  line  displayed (but see the -a and -j options, which change
              this).

              Certain characters are special as in the / command:

              ^N or !
                     Search for lines which do NOT match the pattern.

              ^E or *
                     Search multiple files.  That is, if the search reaches the beginning of  the
                     current  file  without finding a match, the search continues in the previous
                     file in the command line list.

              ^F or @
                     Begin the search at the last line of the last file in the command line list,
                     regardless  of  what is currently displayed on the screen or the settings of
                     the -a or -j options.

              ^K     As in forward searches.

              ^R     As in forward searches.

       ESC-/pattern
              Same as "/*".

       ESC-?pattern
              Same as "?*".

       n      Repeat previous search, for N-th line containing the last pattern.  If the previous
              search  was modified by ^N, the search is made for the N-th line NOT containing the
              pattern.  If the previous search was modified by ^E, the search  continues  in  the
              next  (or  previous)  file  if  not satisfied in the current file.  If the previous
              search was modified by ^R, the search is done without  using  regular  expressions.
              There is no effect if the previous search was modified by ^F or ^K.

       N      Repeat previous search, but in the reverse direction.

       ESC-n  Repeat  previous  search,  but  crossing  file boundaries.  The effect is as if the
              previous search were modified by *.

       ESC-N  Repeat previous search, but in the reverse direction and crossing file boundaries.

       ESC-u  Undo search highlighting.  Turn off highlighting of strings  matching  the  current
              search  pattern.   If  highlighting  is  already  off  because  of a previous ESC-u
              command, turn highlighting back on.  Any search command will also turn highlighting
              back  on.   (Highlighting  can  also be disabled by toggling the -G option; in that
              case search commands do not turn highlighting back on.)

       &pattern
              Display only lines which match the pattern; lines which do not  match  the  pattern
              are  not  displayed.   If  pattern  is empty (if you type & immediately followed by
              ENTER), any filtering is turned off, and all lines are displayed.  While  filtering
              is  in  effect,  an  ampersand  is  displayed  at the beginning of the prompt, as a
              reminder that some lines in the file may be hidden.

              Certain characters are special as in the / command:

              ^N or !
                     Display only lines which do NOT match the pattern.

              ^R     Don't interpret regular expression metacharacters;  that  is,  do  a  simple
                     textual comparison.

       :e [filename]
              Examine a new file.  If the filename is missing, the "current" file (see the :n and
              :p commands below) from the list of files in the command line  is  re-examined.   A
              percent  sign  (%)  in the filename is replaced by the name of the current file.  A
              pound sign (#) is replaced by the name of the previously examined  file.   However,
              two consecutive percent signs are simply replaced with a single percent sign.  This
              allows you to  enter  a  filename  that  contains  a  percent  sign  in  the  name.
              Similarly,  two consecutive pound signs are replaced with a single pound sign.  The
              filename is inserted into the command line list of files so that it can be seen  by
              subsequent :n and :p commands.  If the filename consists of several files, they are
              all inserted into the list of files and the first one is examined.  If the filename
              contains  one  or  more  spaces,  the  entire filename should be enclosed in double
              quotes (also see the -" option).

       ^X^V or E
              Same as :e.  Warning: some systems use ^V as a  special  literalization  character.
              On such systems, you may not be able to use ^V.

       :n     Examine  the  next  file  (from the list of files given in the command line).  If a
              number N is specified, the N-th next file is examined.

       :p     Examine the previous file in the command line list.  If a number  N  is  specified,
              the N-th previous file is examined.

       :x     Examine  the  first file in the command line list.  If a number N is specified, the
              N-th file in the list is examined.

       :d     Remove the current file from the list of files.

       t      Go to the next tag, if there were more than one matches for the current  tag.   See
              the -t option for more details about tags.

       T      Go to the previous tag, if there were more than one matches for the current tag.

       = or ^G or :f
              Prints  some  information  about  the file being viewed, including its name and the
              line number and byte offset of the bottom line being displayed.   If  possible,  it
              also prints the length of the file, the number of lines in the file and the percent
              of the file above the last displayed line.

       -      Followed by one of the command line option letters (see OPTIONS below),  this  will
              change  the  setting of that option and print a message describing the new setting.
              If a ^P (CONTROL-P) is entered immediately after  the  dash,  the  setting  of  the
              option  is  changed  but no message is printed.  If the option letter has a numeric
              value (such as -b or -h), or a string value (such as -P or -t), a new value may  be
              entered  after the option letter.  If no new value is entered, a message describing
              the current setting is printed and nothing is changed.

       --     Like the - command, but takes a long option name (see OPTIONS below) rather than  a
              single option letter.  You must press ENTER or RETURN after typing the option name.
              A ^P immediately after the second dash suppresses printing of a message  describing
              the new setting, as in the - command.

       -+     Followed  by  one  of the command line option letters this will reset the option to
              its default setting and print a message describing the  new  setting.   (The  "-+X"
              command  does the same thing as "-+X" on the command line.)  This does not work for
              string-valued options.

       --+    Like the -+ command, but takes a long option  name  rather  than  a  single  option
              letter.

       -!     Followed  by  one of the command line option letters, this will reset the option to
              the "opposite" of its default setting  and  print  a  message  describing  the  new
              setting.  This does not work for numeric or string-valued options.

       --!    Like  the  -!  command,  but  takes  a long option name rather than a single option
              letter.

       _      (Underscore.)  Followed by one of the command line option letters, this will  print
              a message describing the current setting of that option.  The setting of the option
              is not changed.

       __     (Double underscore.)  Like the _ (underscore) command, but takes a long option name
              rather  than  a  single option letter.  You must press ENTER or RETURN after typing
              the option name.

       +cmd   Causes the specified cmd to be executed each time a  new  file  is  examined.   For
              example,  +G  causes less to initially display each file starting at the end rather
              than the beginning.

       V      Prints the version number of less being run.

       q or Q or :q or :Q or ZZ
              Exits less.

       The following four commands may  or  may  not  be  valid,  depending  on  your  particular
       installation.

       v      Invokes  an editor to edit the current file being viewed.  The editor is taken from
              the environment variable VISUAL if defined, or EDITOR if VISUAL is not defined,  or
              defaults  to "vi" if neither VISUAL nor EDITOR is defined.  See also the discussion
              of LESSEDIT under the section on PROMPTS below.

       ! shell-command
              Invokes a shell to run the shell-command given.  A percent sign (%) in the  command
              is  replaced  by the name of the current file.  A pound sign (#) is replaced by the
              name of the previously examined file.  "!!" repeats the last  shell  command.   "!"
              with  no shell command simply invokes a shell.  On Unix systems, the shell is taken
              from the environment variable SHELL, or defaults  to  "sh".   On  MS-DOS  and  OS/2
              systems, the shell is the normal command processor.

       | <m> shell-command
              <m>  represents  any  mark  letter.  Pipes a section of the input file to the given
              shell command.  The section of the file to be piped is between the position  marked
              by  the  letter  and  the  current  screen.  The entire current screen is included,
              regardless of whether the marked position is before or after  the  current  screen.
              <m>  may  also be ^ or $ to indicate beginning or end of file respectively.  If <m>
              is . or newline, the current screen is piped.

       s filename
              Save the input to a file.  This only works if the input is a pipe, not an  ordinary
              file.

OPTIONS

       Command  line  options  are  described  below.   Most options may be changed while less is
       running, via the "-" command.

       Most options may be given in one of two forms: either a dash followed by a single  letter,
       or  two  dashes  followed by a long option name.  A long option name may be abbreviated as
       long as the abbreviation is unambiguous.  For example, --quit-at-eof  may  be  abbreviated
       --quit,  but  not --qui, since both --quit-at-eof and --quiet begin with --qui.  Some long
       option names are in uppercase, such as  --QUIT-AT-EOF,  as  distinct  from  --quit-at-eof.
       Such option names need only have their first letter capitalized; the remainder of the name
       may be in either case.  For example, --Quit-at-eof is equivalent to --QUIT-AT-EOF.

       Options are also taken from the environment variable "LESS".  For example, to avoid typing
       "less -options ..." each time less is invoked, you might tell csh:

       setenv LESS "-options"

       or if you use sh:

       LESS="-options"; export LESS

       On  MS-DOS,  you  don't  need  the quotes, but you should replace any percent signs in the
       options string by double percent signs.

       The environment variable is parsed before  the  command  line,  so  command  line  options
       override the LESS environment variable.  If an option appears in the LESS variable, it can
       be reset to its default value on the command line by beginning  the  command  line  option
       with "-+".

       Some  options  like -k or -D require a string to follow the option letter.  The string for
       that option is considered to end when a dollar sign ($) is found.  For  example,  you  can
       set two -D options on MS-DOS like this:

       LESS="Dn9.1$Ds4.1"

       If  the  --use-backslash  option  appears  earlier  in  the options, then a dollar sign or
       backslash may be included literally in an option string by preceding it with a  backslash.
       If  the  --use-backslash  option  is  not  in  effect,  then  backslashes  are not treated
       specially, and there is no way to include a dollar sign in the option string.

       -? or --help
              This option displays a summary of the commands accepted by less (the same as the  h
              command).   (Depending  on  how  your shell interprets the question mark, it may be
              necessary to quote the question mark, thus: "-\?".)

       -a or --search-skip-screen
              By default, forward searches start at the top of the displayed screen and backwards
              searches  start at the bottom of the displayed screen (except for repeated searches
              invoked by the n or N commands, which start  after  or  before  the  "target"  line
              respectively;  see  the  -j  option for more about the target line).  The -a option
              causes forward searches to instead start at the bottom of the screen  and  backward
              searches  to  start  at the top of the screen, thus skipping all lines displayed on
              the screen.

       -A or --SEARCH-SKIP-SCREEN
              Causes all forward searches (not just non-repeated searches) to  start  just  after
              the  target  line,  and all backward searches to start just before the target line.
              Thus, forward searches will skip part of the displayed screen (from the first  line
              up  to  and including the target line).  Similarly backwards searches will skip the
              displayed screen from the last line up to and including the target line.  This  was
              the default behavior in less versions prior to 441.

       -bn or --buffers=n
              Specifies  the  amount  of  buffer  space  less will use for each file, in units of
              kilobytes (1024 bytes).  By default 64 K of buffer space  is  used  for  each  file
              (unless  the  file  is a pipe; see the -B option).  The -b option specifies instead
              that n kilobytes of buffer space should be used for each file.  If n is -1,  buffer
              space is unlimited; that is, the entire file can be read into memory.

       -B or --auto-buffers
              By  default,  when data is read from a pipe, buffers are allocated automatically as
              needed.  If a large amount of data is read from the pipe, this can  cause  a  large
              amount of memory to be allocated.  The -B option disables this automatic allocation
              of buffers for pipes, so that only 64 K (or the amount of space specified by the -b
              option)  is used for the pipe.  Warning: use of -B can result in erroneous display,
              since only the most recently viewed part of the piped data is kept in  memory;  any
              earlier data is lost.

       -c or --clear-screen
              Causes full screen repaints to be painted from the top line down.  By default, full
              screen repaints are done by scrolling from the bottom of the screen.

       -C or --CLEAR-SCREEN
              Same as -c, for compatibility with older versions of less.

       -d or --dumb
              The -d option suppresses the error message normally displayed if  the  terminal  is
              dumb;  that  is,  lacks some important capability, such as the ability to clear the
              screen or scroll backward.  The -d option does not otherwise change the behavior of
              less on a dumb terminal.

       -Dxcolor or --color=xcolor
              [MS-DOS  only] Sets the color of the text displayed.  x is a single character which
              selects the type of text whose color is being set:  n=normal,  s=standout,  d=bold,
              u=underlined,  k=blink.   color  is  a  pair of numbers separated by a period.  The
              first number selects the foreground color and the  second  selects  the  background
              color  of  the  text.   A single number N is the same as N.M, where M is the normal
              background color.  The color may start or end with u to  use  underline  (with  the
              normal  color, if by itself), if the system supports it (Windows only).  x may also
              be a to toggle strict ANSI sequence rendering (SGR mode).

       -e or --quit-at-eof
              Causes less to automatically exit the  second  time  it  reaches  end-of-file.   By
              default, the only way to exit less is via the "q" command.

       -E or --QUIT-AT-EOF
              Causes less to automatically exit the first time it reaches end-of-file.

       -f or --force
              Forces  non-regular  files  to  be opened.  (A non-regular file is a directory or a
              device special file.)  Also suppresses the warning message when a  binary  file  is
              opened.   By  default,  less will refuse to open non-regular files.  Note that some
              operating systems will not allow directories to be read, even if -f is set.

       -F or --quit-if-one-screen
              Causes less to automatically exit if the entire file can be displayed on the  first
              screen.

       -g or --hilite-search
              Normally, less will highlight ALL strings which match the last search command.  The
              -g option changes this behavior to highlight only the particular string  which  was
              found  by the last search command.  This can cause less to run somewhat faster than
              the default.

       -G or --HILITE-SEARCH
              The -G option suppresses all highlighting of strings found by search commands.

       -hn or --max-back-scroll=n
              Specifies a maximum number of lines to scroll backward.   If  it  is  necessary  to
              scroll  backward  more than n lines, the screen is repainted in a forward direction
              instead.  (If the terminal does not have the ability to  scroll  backward,  -h0  is
              implied.)

       -i or --ignore-case
              Causes  searches  to  ignore  case; that is, uppercase and lowercase are considered
              identical.  This option is ignored if any uppercase letters appear  in  the  search
              pattern;  in other words, if a pattern contains uppercase letters, then that search
              does not ignore case.

       -I or --IGNORE-CASE
              Like -i, but searches ignore case even if the pattern contains uppercase letters.

       -jn or --jump-target=n
              Specifies a line on the screen where the "target" line is to  be  positioned.   The
              target line is the line specified by any command to search for a pattern, jump to a
              line number, jump to a file percentage or jump to a tag.  The screen  line  may  be
              specified  by  a number: the top line on the screen is 1, the next is 2, and so on.
              The number may be negative to specify a line relative to the bottom of the  screen:
              the  bottom  line  on  the screen is -1, the second to the bottom is -2, and so on.
              Alternately, the screen line may be specified as a fraction of the  height  of  the
              screen,  starting  with  a  decimal point: .5 is in the middle of the screen, .3 is
              three tenths down from the first line, and so on.  If the line is  specified  as  a
              fraction, the actual line number is recalculated if the terminal window is resized,
              so that the target line remains at the specified fraction of the screen height.  If
              any  form  of the -j option is used, repeated forward searches (invoked with "n" or
              "N") begin at the line immediately after the target  line,  and  repeated  backward
              searches  begin  at  the  target line, unless changed by -a or -A.  For example, if
              "-j4" is used, the target line is  the  fourth  line  on  the  screen,  so  forward
              searches  begin  at  the  fifth  line  on the screen.  However nonrepeated searches
              (invoked with "/" or "?")  always begin at the start or end of the  current  screen
              respectively.

       -J or --status-column
              Displays  a  status column at the left edge of the screen.  The status column shows
              the lines that matched the current search, and any lines that are marked (via the m
              or M command).  The status column is also used if the -w or -W option is in effect.

       -kfilename or --lesskey-file=filename
              Causes  less  to open and interpret the named file as a lesskey (1) file.  Multiple
              -k options may be specified.  If the LESSKEY or LESSKEY_SYSTEM environment variable
              is set, or if a lesskey file is found in a standard place (see KEY BINDINGS), it is
              also used as a lesskey file.

       -K or --quit-on-intr
              Causes less to exit  immediately  (with  status  2)  when  an  interrupt  character
              (usually  ^C)  is  typed.   Normally,  an  interrupt  character causes less to stop
              whatever it is doing and return to its command  prompt.   Note  that  use  of  this
              option makes it impossible to return to the command prompt from the "F" command.

       -L or --no-lessopen
              Ignore  the  LESSOPEN  environment  variable  (see  the  INPUT PREPROCESSOR section
              below).  This option can be set from within less, but it will apply only  to  files
              opened subsequently, not to the file which is currently open.

       -m or --long-prompt
              Causes  less  to  prompt verbosely (like more), with the percent into the file.  By
              default, less prompts with a colon.

       -M or --LONG-PROMPT
              Causes less to prompt even more verbosely than more.

       -n or --line-numbers
              Suppresses line numbers.  The default (to use line numbers) may cause less  to  run
              more  slowly  in  some cases, especially with a very large input file.  Suppressing
              line numbers with the -n option will avoid this problem.  Using line numbers means:
              the  line  number will be displayed in the verbose prompt and in the = command, and
              the v command will pass the current  line  number  to  the  editor  (see  also  the
              discussion of LESSEDIT in PROMPTS below).

       -N or --LINE-NUMBERS
              Causes a line number to be displayed at the beginning of each line in the display.

       -ofilename or --log-file=filename
              Causes  less  to  copy  its  input  to  the named file as it is being viewed.  This
              applies only when the input file is a pipe, not an  ordinary  file.   If  the  file
              already exists, less will ask for confirmation before overwriting it.

       -Ofilename or --LOG-FILE=filename
              The -O option is like -o, but it will overwrite an existing file without asking for
              confirmation.

              If no log file has been specified, the -o and -O options can be  used  from  within
              less  to specify a log file.  Without a file name, they will simply report the name
              of the log file.  The "s" command is equivalent to specifying -o from within less.

       -ppattern or --pattern=pattern
              The -p option on the command line is equivalent to specifying +/pattern;  that  is,
              it tells less to start at the first occurrence of pattern in the file.

       -Pprompt or --prompt=prompt
              Provides  a  way  to  tailor  the three prompt styles to your own preference.  This
              option would normally be put in the LESS environment variable,  rather  than  being
              typed  in with each less command.  Such an option must either be the last option in
              the LESS variable, or be terminated by a dollar sign.
               -Ps followed by a string changes the default (short) prompt to that string.
               -Pm changes the medium (-m) prompt.
               -PM changes the long (-M) prompt.
               -Ph changes the prompt for the help screen.
               -P= changes the message printed by the = command.
               -Pw changes the message printed while waiting for data (in the F command).

              All prompt strings consist of a sequence of letters and special  escape  sequences.
              See the section on PROMPTS for more details.

       -q or --quiet or --silent
              Causes moderately "quiet" operation: the terminal bell is not rung if an attempt is
              made to scroll past the end of the file or before the beginning of  the  file.   If
              the  terminal  has  a  "visual bell", it is used instead.  The bell will be rung on
              certain other errors, such as typing an invalid character.  The default is to  ring
              the terminal bell in all such cases.

       -Q or --QUIET or --SILENT
              Causes totally "quiet" operation: the terminal bell is never rung.  If the terminal
              has a "visual bell", it is used in all cases where the  terminal  bell  would  have
              been rung.

       -r or --raw-control-chars
              Causes "raw" control characters to be displayed.  The default is to display control
              characters using the caret notation;  for  example,  a  control-A  (octal  001)  is
              displayed  as "^A".  Warning: when the -r option is used, less cannot keep track of
              the actual appearance of the screen (since this depends on how the screen  responds
              to  each  type  of  control character).  Thus, various display problems may result,
              such as long lines being split in the wrong place.

       -R or --RAW-CONTROL-CHARS
              Like -r, but only ANSI "color" escape sequences are output in "raw"  form.   Unlike
              -r,  the  screen  appearance  is  maintained correctly in most cases.  ANSI "color"
              escape sequences are sequences of the form:

                   ESC [ ... m

              where the "..." is zero or more color specification characters For the  purpose  of
              keeping  track of screen appearance, ANSI color escape sequences are assumed to not
              move the cursor.  You can make less think that characters other than  "m"  can  end
              ANSI color escape sequences by setting the environment variable LESSANSIENDCHARS to
              the list of characters which can end a color escape sequence.   And  you  can  make
              less  think that characters other than the standard ones may appear between the ESC
              and the m by setting the environment  variable  LESSANSIMIDCHARS  to  the  list  of
              characters which can appear.

       -s or --squeeze-blank-lines
              Causes  consecutive  blank  lines to be squeezed into a single blank line.  This is
              useful when viewing nroff output.

       -S or --chop-long-lines
              Causes lines longer than the screen width to be  chopped  (truncated)  rather  than
              wrapped.  That is, the portion of a long line that does not fit in the screen width
              is not shown.  The default is to wrap long lines; that is, display the remainder on
              the next line.

       -ttag or --tag=tag
              The  -t  option,  followed immediately by a TAG, will edit the file containing that
              tag.  For this to work, tag information must be available; for example,  there  may
              be  a  file  in  the current directory called "tags", which was previously built by
              ctags (1) or an equivalent command.  If the environment variable LESSGLOBALTAGS  is
              set,  it  is taken to be the name of a command compatible with global (1), and that
              command      is       executed       to       find       the       tag.        (See
              http://www.gnu.org/software/global/global.html).    The   -t  option  may  also  be
              specified from within less (using the - command) as a way of examining a new  file.
              The command ":t" is equivalent to specifying -t from within less.

       -Ttagsfile or --tag-file=tagsfile
              Specifies a tags file to be used instead of "tags".

       -u or --underline-special
              Causes  backspaces and carriage returns to be treated as printable characters; that
              is, they are sent to the terminal when they appear in the input.

       -U or --UNDERLINE-SPECIAL
              Causes backspaces, tabs, carriage returns and "formatting characters"  (as  defined
              by  Unicode)  to  be  treated  as  control characters; that is, they are handled as
              specified by the -r option.

              By default, if neither -u nor -U is given, backspaces which appear adjacent  to  an
              underscore  character are treated specially: the underlined text is displayed using
              the terminal's hardware underlining  capability.   Also,  backspaces  which  appear
              between  two  identical  characters  are  treated specially: the overstruck text is
              printed using the terminal's hardware boldface capability.   Other  backspaces  are
              deleted, along with the preceding character.  Carriage returns immediately followed
              by a newline are deleted.  Other carriage returns are handled as specified  by  the
              -r  option.   Text which is overstruck or underlined can be searched for if neither
              -u nor -U is in effect.

       -V or --version
              Displays the version number of less.

       -w or --hilite-unread
              Temporarily highlights the first "new" line after a  forward  movement  of  a  full
              page.   The  first "new" line is the line immediately following the line previously
              at the bottom of the screen.  Also highlights the  target  line  after  a  g  or  p
              command.   The highlight is removed at the next command which causes movement.  The
              entire line is highlighted, unless the -J option is in effect, in which  case  only
              the status column is highlighted.

       -W or --HILITE-UNREAD
              Like  -w,  but temporarily highlights the first new line after any forward movement
              command larger than one line.

       -xn,... or --tabs=n,...
              Sets tab stops.  If only one n is specified, tab stops are set at multiples  of  n.
              If  multiple  values  separated by commas are specified, tab stops are set at those
              positions, and then continue with the same spacing as the last two.   For  example,
              -x9,17 will set tabs at positions 9, 17, 25, 33, etc.  The default for n is 8.

       -X or --no-init
              Disables  sending  the  termcap  initialization and deinitialization strings to the
              terminal.   This  is  sometimes  desirable  if  the  deinitialization  string  does
              something unnecessary, like clearing the screen.

       -yn or --max-forw-scroll=n
              Specifies  a  maximum  number  of  lines  to scroll forward.  If it is necessary to
              scroll forward more than n lines, the screen is repainted instead.  The  -c  or  -C
              option  may  be used to repaint from the top of the screen if desired.  By default,
              any forward movement causes scrolling.

       -zn or --window=n or -n
              Changes the default  scrolling  window  size  to  n  lines.   The  default  is  one
              screenful.   The  z and w commands can also be used to change the window size.  The
              "z" may be omitted for compatibility with some versions of more.  If the  number  n
              is  negative, it indicates n lines less than the current screen size.  For example,
              if the screen is 24 lines, -z-4 sets the scrolling window  to  20  lines.   If  the
              screen  is  resized  to  40 lines, the scrolling window automatically changes to 36
              lines.

       -"cc or --quotes=cc
              Changes the filename quoting character.  This may be necessary if you are trying to
              name  a file which contains both spaces and quote characters.  Followed by a single
              character,  this  changes  the  quote  character  to  that  character.    Filenames
              containing  a  space  should  then  be  surrounded by that character rather than by
              double quotes.  Followed by two characters, changes the open  quote  to  the  first
              character,  and  the  close  quote to the second character.  Filenames containing a
              space should then be preceded by the open quote character and followed by the close
              quote  character.   Note  that  even  after  the quote characters are changed, this
              option remains -" (a dash followed by a double quote).

       -~ or --tilde
              Normally lines after end of file are displayed as a single tilde (~).  This  option
              causes lines after end of file to be displayed as blank lines.

       -# or --shift
              Specifies  the default number of positions to scroll horizontally in the RIGHTARROW
              and LEFTARROW commands.  If the number specified  is  zero,  it  sets  the  default
              number  of  positions to one half of the screen width.  Alternately, the number may
              be specified as a fraction of the width of the  screen,  starting  with  a  decimal
              point:  .5 is half of the screen width, .3 is three tenths of the screen width, and
              so on.  If the number is specified as a  fraction,  the  actual  number  of  scroll
              positions  is  recalculated  if  the terminal window is resized, so that the actual
              scroll remains at the specified fraction of the screen width.

       --follow-name
              Normally, if the input file is renamed while an F command is executing,  less  will
              continue  to display the contents of the original file despite its name change.  If
              --follow-name is specified, during an F command less will periodically  attempt  to
              reopen  the  file by name.  If the reopen succeeds and the file is a different file
              from the original (which means that a new file has been created with the same  name
              as  the  original  (now  renamed) file), less will display the contents of that new
              file.

       --mouse
              Enables mouse input: scrolling the mouse wheel down  moves  forward  in  the  file,
              scrolling  the  mouse  wheel up moves backwards in the file, and clicking the mouse
              sets the "#" mark to the line where the mouse is clicked.  The number of  lines  to
              scroll when the wheel is moved can be set by the --wheel-lines option.  Mouse input
              works only on terminals which support X11  mouse  reporting,  and  on  the  Windows
              version of less.

       --MOUSE
              Like --mouse, except the direction scrolled on mouse wheel movement is reversed.

       --no-keypad
              Disables  sending  the  keypad  initialization  and deinitialization strings to the
              terminal.  This is sometimes useful if the keypad strings make the  numeric  keypad
              behave in an undesirable manner.

       --no-histdups
              This  option  changes the behavior so that if a search string or file name is typed
              in, and the same string is already in  the  history  list,  the  existing  copy  is
              removed  from  the  history list before the new one is added.  Thus, a given string
              will appear only once in the history list.  Normally, a string may appear  multiple
              times.

       --rscroll
              This  option changes the character used to mark truncated lines.  It may begin with
              a two-character attribute indicator like LESSBINFMT does.  If there is no attribute
              indicator, standout is used.  If set to "-", truncated lines are not marked.

       --save-marks
              Save  marks in the history file, so marks are retained across different invocations
              of less.

       --use-backslash
              This option changes the interpretations of options which follow  this  one.   After
              the  --use-backslash  option,  any backslash in an option string is removed and the
              following character is taken literally.  This allows a dollar sign to  be  included
              in option strings.

       --wheel-lines=n
              Set  the number of lines to scroll when the mouse wheel is scrolled and the --mouse
              or --MOUSE option is in effect.  The default is 1 line.

       --     A command line argument of "--" marks the end of option arguments.   Any  arguments
              following  this  are  interpreted  as filenames.  This can be useful when viewing a
              file whose name begins with a "-" or "+".

       +      If a command line option begins with +, the remainder of that option is taken to be
              an  initial command to less.  For example, +G tells less to start at the end of the
              file rather than the beginning, and +/xyz tells it to start at the first occurrence
              of  "xyz" in the file.  As a special case, +<number> acts like +<number>g; that is,
              it starts the display at the specified line number (however, see the  caveat  under
              the  "g" command above).  If the option starts with ++, the initial command applies
              to every file being viewed, not just  the  first  one.   The  +  command  described
              previously may also be used to set (or change) an initial command for every file.

LINE EDITING

       When entering command line at the bottom of the screen (for example, a filename for the :e
       command, or the pattern for a search command), certain keys can be used to manipulate  the
       command line.  Most commands have an alternate form in [ brackets ] which can be used if a
       key does not exist on a particular keyboard.  (Note that the forms beginning with  ESC  do
       not work in some MS-DOS and Windows systems because ESC is the line erase character.)  Any
       of these special keys may  be  entered  literally  by  preceding  it  with  the  "literal"
       character,  either ^V or ^A.  A backslash itself may also be entered literally by entering
       two backslashes.

       LEFTARROW [ ESC-h ]
              Move the cursor one space to the left.

       RIGHTARROW [ ESC-l ]
              Move the cursor one space to the right.

       ^LEFTARROW [ ESC-b or ESC-LEFTARROW ]
              (That is, CONTROL and LEFTARROW simultaneously.)  Move the cursor one word  to  the
              left.

       ^RIGHTARROW [ ESC-w or ESC-RIGHTARROW ]
              (That  is, CONTROL and RIGHTARROW simultaneously.)  Move the cursor one word to the
              right.

       HOME [ ESC-0 ]
              Move the cursor to the beginning of the line.

       END [ ESC-$ ]
              Move the cursor to the end of the line.

       BACKSPACE
              Delete the character to the left of the  cursor,  or  cancel  the  command  if  the
              command line is empty.

       DELETE or [ ESC-x ]
              Delete the character under the cursor.

       ^BACKSPACE [ ESC-BACKSPACE ]
              (That  is,  CONTROL  and BACKSPACE simultaneously.)  Delete the word to the left of
              the cursor.

       ^DELETE [ ESC-X or ESC-DELETE ]
              (That is, CONTROL and DELETE simultaneously.)  Delete the word under the cursor.

       UPARROW [ ESC-k ]
              Retrieve the previous command line.  If you first enter some text  and  then  press
              UPARROW, it will retrieve the previous command which begins with that text.

       DOWNARROW [ ESC-j ]
              Retrieve  the  next  command  line.   If  you  first enter some text and then press
              DOWNARROW, it will retrieve the next command which begins with that text.

       TAB    Complete the partial filename to the left of the cursor.  If it matches  more  than
              one filename, the first match is entered into the command line.  Repeated TABs will
              cycle thru the other matching filenames.  If the completed filename is a directory,
              a  "/"  is  appended to the filename.  (On MS-DOS systems, a "\" is appended.)  The
              environment variable LESSSEPARATOR can be used to specify a different character  to
              append to a directory name.

       BACKTAB [ ESC-TAB ]
              Like, TAB, but cycles in the reverse direction thru the matching filenames.

       ^L     Complete  the  partial filename to the left of the cursor.  If it matches more than
              one filename, all matches are entered into the command line (if they fit).

       ^U (Unix and OS/2) or ESC (MS-DOS)
              Delete the entire command line, or cancel the command if the command line is empty.
              If  you  have  changed your line-kill character in Unix to something other than ^U,
              that character is used instead of ^U.

       ^G     Delete the entire command line and return to the main prompt.

KEY BINDINGS

       You may define your own less commands by using the program lesskey (1) to create a lesskey
       file.   This  file specifies a set of command keys and an action associated with each key.
       You may also use lesskey to change the line-editing keys (see LINE EDITING),  and  to  set
       environment  variables.  If the environment variable LESSKEY is set, less uses that as the
       name of the lesskey file.  Otherwise, less looks in a standard place for the lesskey file:
       On  Unix  systems,  less  looks  for  a  lesskey file called "$HOME/.less".  On MS-DOS and
       Windows systems, less looks for a lesskey file called "$HOME/_less",  and  if  it  is  not
       found  there,  then  looks for a lesskey file called "_less" in any directory specified in
       the PATH environment variable.  On OS/2 systems, less looks  for  a  lesskey  file  called
       "$HOME/less.ini",  and if it is not found, then looks for a lesskey file called "less.ini"
       in any directory specified in the INIT environment variable, and if it  not  found  there,
       then  looks  for  a  lesskey file called "less.ini" in any directory specified in the PATH
       environment variable.  See the lesskey manual page for more details.

       A system-wide lesskey file may also be set up to  provide  key  bindings.   If  a  key  is
       defined  in  both  a  local  lesskey file and in the system-wide file, key bindings in the
       local file take precedence over  those  in  the  system-wide  file.   If  the  environment
       variable  LESSKEY_SYSTEM  is  set,  less  uses that as the name of the system-wide lesskey
       file.  Otherwise, less looks in a standard place for the system-wide lesskey file: On Unix
       systems,  the  system-wide  lesskey file is /usr/local/etc/sysless.  (However, if less was
       built with a different sysconf directory than /usr/local/etc, that directory is where  the
       sysless  file  is  found.)  On MS-DOS and Windows systems, the system-wide lesskey file is
       c:\_sysless.  On OS/2 systems, the system-wide lesskey file is c:\sysless.ini.

INPUT PREPROCESSOR

       You may define an "input preprocessor" for less.  Before less opens a file, it first gives
       your input preprocessor a chance to modify the way the contents of the file are displayed.
       An input preprocessor is simply an executable program (or shell script), which writes  the
       contents  of  the  file to a different file, called the replacement file.  The contents of
       the replacement file are then displayed in place of the contents  of  the  original  file.
       However,  it will appear to the user as if the original file is opened; that is, less will
       display the original filename as the name of the current file.

       An input preprocessor receives one  command  line  argument,  the  original  filename,  as
       entered  by the user.  It should create the replacement file, and when finished, print the
       name of the replacement file to its standard output.  If the input preprocessor  does  not
       output  a  replacement  filename,  less  uses  the  original  file,  as normal.  The input
       preprocessor is not called when viewing standard input.  To set up an input  preprocessor,
       set  the  LESSOPEN  environment  variable  to  a command line which will invoke your input
       preprocessor.  This command line should include one occurrence of the string  "%s",  which
       will be replaced by the filename when the input preprocessor command is invoked.

       When  less  closes  a  file opened in such a way, it will call another program, called the
       input postprocessor, which may perform any desired clean-up action (such as  deleting  the
       replacement  file created by LESSOPEN).  This program receives two command line arguments,
       the original filename as entered by the user, and the name of the  replacement  file.   To
       set  up  an  input postprocessor, set the LESSCLOSE environment variable to a command line
       which will invoke your input postprocessor.  It may include two occurrences of the  string
       "%s";  the  first  is  replaced with the original name of the file and the second with the
       name of the replacement file, which was output by LESSOPEN.

       For example, on many Unix systems, these two scripts will  allow  you  to  keep  files  in
       compressed format, but still let less view them directly:

       lessopen.sh:
            #! /bin/sh
            case "$1" in
            *.Z) TEMPFILE=$(mktemp)
                 uncompress -c $1  >$TEMPFILE  2>/dev/null
                 if [ -s $TEMPFILE ]; then
                      echo $TEMPFILE
                 else
                      rm -f $TEMPFILE
                 fi
                 ;;
            esac

       lessclose.sh:
            #! /bin/sh
            rm $2

       To   use   these   scripts,   put   them   both   where  they  can  be  executed  and  set
       LESSOPEN="lessopen.sh %s", and LESSCLOSE="lessclose.sh %s %s".  More complex LESSOPEN  and
       LESSCLOSE scripts may be written to accept other types of compressed files, and so on.

       It  is  also  possible  to  set up an input preprocessor to pipe the file data directly to
       less, rather than putting the data into a replacement  file.   This  avoids  the  need  to
       decompress  the  entire file before starting to view it.  An input preprocessor that works
       this way is called an input pipe.  An input  pipe,  instead  of  writing  the  name  of  a
       replacement  file  on  its  standard output, writes the entire contents of the replacement
       file on its standard output.  If the input pipe does  not  write  any  characters  on  its
       standard  output,  then  there  is no replacement file and less uses the original file, as
       normal.  To use an input pipe, make  the  first  character  in  the  LESSOPEN  environment
       variable  a  vertical bar (|) to signify that the input preprocessor is an input pipe.  As
       with non-pipe input preprocessors, the command string must contain one occurrence  of  %s,
       which is replaced with the filename of the input file.

       For  example,  on  many  Unix  systems,  this  script  will work like the previous example
       scripts:

       lesspipe.sh:
            #! /bin/sh
            case "$1" in
            *.Z) uncompress -c $1  2>/dev/null
                 ;;
            *)   exit 1
                 ;;
            esac
            exit $?

       To use this script, put it where it can be executed and set LESSOPEN="|lesspipe.sh %s".

       Note that a preprocessor cannot output an empty file, since that is interpreted as meaning
       there is no replacement, and the original file is used.  To avoid this, if LESSOPEN starts
       with two vertical bars, the exit status of the script becomes  meaningful.   If  the  exit
       status  is zero, the output is considered to be replacement text, even if it is empty.  If
       the exit status is nonzero, any output is ignored and the  original  file  is  used.   For
       compatibility  with  previous  versions of less, if LESSOPEN starts with only one vertical
       bar, the exit status of the preprocessor is ignored.

       When an input pipe is used, a LESSCLOSE postprocessor can be used, but it is  usually  not
       necessary  since  there is no replacement file to clean up.  In this case, the replacement
       file name passed to the LESSCLOSE postprocessor is "-".

       For compatibility with previous versions of less, the input preprocessor or  pipe  is  not
       used  if less is viewing standard input.  However, if the first character of LESSOPEN is a
       dash (-), the input preprocessor is used on standard input as well  as  other  files.   In
       this case, the dash is not considered to be part of the preprocessor command.  If standard
       input is being viewed, the input preprocessor is passed a file name consisting of a single
       dash.   Similarly,  if the first two characters of LESSOPEN are vertical bar and dash (|-)
       or two vertical bars and a dash (||-), the input pipe is used on standard input as well as
       other  files.  Again, in this case the dash is not considered to be part of the input pipe
       command.

NATIONAL CHARACTER SETS

       There are three types of characters in the input file:

       normal characters
              can be displayed directly to the screen.

       control characters
              should not be displayed directly, but are expected to be  found  in  ordinary  text
              files (such as backspace and tab).

       binary characters
              should not be displayed directly and are not expected to be found in text files.

       A "character set" is simply a description of which characters are to be considered normal,
       control, and binary.  The LESSCHARSET  environment  variable  may  be  used  to  select  a
       character set.  Possible values for LESSCHARSET are:

       ascii  BS, TAB, NL, CR, and formfeed are control characters, all chars with values between
              32 and 126 are normal, and all others are binary.

       iso8859
              Selects an ISO 8859 character set.  This is the same as  ASCII,  except  characters
              between 160 and 255 are treated as normal characters.

       latin1 Same as iso8859.

       latin9 Same as iso8859.

       dos    Selects a character set appropriate for MS-DOS.

       ebcdic Selects an EBCDIC character set.

       IBM-1047
              Selects  an  EBCDIC character set used by OS/390 Unix Services.  This is the EBCDIC
              analogue of latin1.  You get similar results by setting either LESSCHARSET=IBM-1047
              or LC_CTYPE=en_US in your environment.

       koi8-r Selects a Russian character set.

       next   Selects a character set appropriate for NeXT computers.

       utf-8  Selects  the  UTF-8  encoding  of the ISO 10646 character set.  UTF-8 is special in
              that it supports multi-byte characters in the input file.  It is the only character
              set that supports multi-byte characters.

       windows
              Selects a character set appropriate for Microsoft Windows (cp 1251).

       In rare cases, it may be desired to tailor less to use a character set other than the ones
       definable by LESSCHARSET.  In this case, the environment variable LESSCHARDEF can be  used
       to  define  a  character  set.   It  should be set to a string where each character in the
       string represents one character in the character set.  The character "."  is  used  for  a
       normal  character,  "c" for control, and "b" for binary.  A decimal number may be used for
       repetition.  For example, "bccc4b." would mean character 0 is  binary,  1,  2  and  3  are
       control,  4,  5,  6  and 7 are binary, and 8 is normal.  All characters after the last are
       taken to be the same as the last, so characters 9 through 255 would be normal.   (This  is
       an example, and does not necessarily represent any real character set.)

       This  table  shows  the  value  of LESSCHARDEF which is equivalent to each of the possible
       values for LESSCHARSET:

            ascii     8bcccbcc18b95.b
            dos       8bcccbcc12bc5b95.b.
            ebcdic    5bc6bcc7bcc41b.9b7.9b5.b..8b6.10b6.b9.7b
                      9.8b8.17b3.3b9.7b9.8b8.6b10.b.b.b.
            IBM-1047  4cbcbc3b9cbccbccbb4c6bcc5b3cbbc4bc4bccbc
                      191.b
            iso8859   8bcccbcc18b95.33b.
            koi8-r    8bcccbcc18b95.b128.
            latin1    8bcccbcc18b95.33b.
            next      8bcccbcc18b95.bb125.bb

       If neither LESSCHARSET nor LESSCHARDEF is set, but any of  the  strings  "UTF-8",  "UTF8",
       "utf-8" or "utf8" is found in the LC_ALL, LC_CTYPE or LANG environment variables, then the
       default character set is utf-8.

       If that string is not found, but your system supports the setlocale interface,  less  will
       use setlocale to determine the character set.  setlocale is controlled by setting the LANG
       or LC_CTYPE environment variables.

       Finally, if the setlocale interface is also not available, the default  character  set  is
       latin1.

       Control  and  binary  characters  are  displayed  in  standout (reverse video).  Each such
       character is displayed in caret notation if  possible  (e.g.  ^A  for  control-A).   Caret
       notation  is  used only if inverting the 0100 bit results in a normal printable character.
       Otherwise, the character is displayed as a hex number in angle brackets.  This format  can
       be  changed  by  setting the LESSBINFMT environment variable.  LESSBINFMT may begin with a
       "*" and one character to select the display attribute: "*k" is  blinking,  "*d"  is  bold,
       "*u"  is  underlined,  "*s" is standout, and "*n" is normal.  If LESSBINFMT does not begin
       with a "*", normal attribute is assumed.  The remainder of LESSBINFMT is  a  string  which
       may  include  one  printf-style  escape  sequence (a % followed by x, X, o, d, etc.).  For
       example, if  LESSBINFMT  is  "*u[%x]",  binary  characters  are  displayed  in  underlined
       hexadecimal  surrounded  by  brackets.   The  default  if  no  LESSBINFMT  is specified is
       "*s<%02X>".  Warning: the result of expanding the character via LESSBINFMT  must  be  less
       than 31 characters.

       When  the character set is utf-8, the LESSUTFBINFMT environment variable acts similarly to
       LESSBINFMT but it applies to Unicode code points that were successfully  decoded  but  are
       unsuitable  for display (e.g., unassigned code points).  Its default value is "<U+%04lX>".
       Note that LESSUTFBINFMT and LESSBINFMT share their display  attribute  setting  ("*x")  so
       specifying one will affect both; LESSUTFBINFMT is read after LESSBINFMT so its setting, if
       any, will have priority.  Problematic octets in  a  UTF-8  file  (octets  of  a  truncated
       sequence,  octets  of a complete but non-shortest form sequence, illegal octets, and stray
       trailing  octets)  are  displayed  individually  using  LESSBINFMT  so  as  to  facilitate
       diagnostic of how the UTF-8 file is ill-formed.

PROMPTS

       The -P option allows you to tailor the prompt to your preference.  The string given to the
       -P option replaces the specified prompt string.  Certain  characters  in  the  string  are
       interpreted specially.  The prompt mechanism is rather complicated to provide flexibility,
       but the ordinary user need not understand the details of constructing personalized  prompt
       strings.

       A  percent sign followed by a single character is expanded according to what the following
       character is:

       %bX    Replaced by the byte offset into the current input file.  The b is  followed  by  a
              single  character  (shown as X above) which specifies the line whose byte offset is
              to be used.  If the character is a "t", the byte offset of  the  top  line  in  the
              display is used, an "m" means use the middle line, a "b" means use the bottom line,
              a "B" means use the line just after the bottom  line,  and  a  "j"  means  use  the
              "target" line, as specified by the -j option.

       %B     Replaced by the size of the current input file.

       %c     Replaced  by  the  column  number  of the text appearing in the first column of the
              screen.

       %dX    Replaced by the page number of a line in the input file.  The line to  be  used  is
              determined by the X, as with the %b option.

       %D     Replaced by the number of pages in the input file, or equivalently, the page number
              of the last line in the input file.

       %E     Replaced by the name of the editor (from the VISUAL environment  variable,  or  the
              EDITOR  environment  variable if VISUAL is not defined).  See the discussion of the
              LESSEDIT feature below.

       %f     Replaced by the name of the current input file.

       %F     Replaced by the last component of the name of the current input file.

       %g     Replaced by the shell-escaped name of the current input file.  This is useful  when
              the expanded string will be used in a shell command, such as in LESSEDIT.

       %i     Replaced by the index of the current file in the list of input files.

       %lX    Replaced  by  the  line number of a line in the input file.  The line to be used is
              determined by the X, as with the %b option.

       %L     Replaced by the line number of the last line in the input file.

       %m     Replaced by the total number of input files.

       %pX    Replaced by the percent into the current input file, based on  byte  offsets.   The
              line used is determined by the X as with the %b option.

       %PX    Replaced  by  the  percent into the current input file, based on line numbers.  The
              line used is determined by the X as with the %b option.

       %s     Same as %B.

       %t     Causes any trailing spaces to be removed.  Usually used at the end of  the  string,
              but may appear anywhere.

       %T     Normally  expands  to  the  word  "file".  However if viewing files via a tags list
              using the -t option, it expands to the word "tag".

       %x     Replaced by the name of the next input file in the list.

       If any item is unknown (for example, the file size if input is a pipe), a question mark is
       printed instead.

       The  format  of  the  prompt  string  can  be  changed depending on certain conditions.  A
       question mark followed by a single character acts like an "IF": depending on the following
       character,  a  condition is evaluated.  If the condition is true, any characters following
       the question mark and condition character, up to a period, are included in the prompt.  If
       the  condition  is false, such characters are not included.  A colon appearing between the
       question mark and the period can be used to establish an "ELSE":  any  characters  between
       the  colon  and  the  period are included in the string if and only if the IF condition is
       false.  Condition characters (which follow a question mark) may be:

       ?a     True if any characters have been included in the prompt so far.

       ?bX    True if the byte offset of the specified line is known.

       ?B     True if the size of current input file is known.

       ?c     True if the text is horizontally shifted (%c is not zero).

       ?dX    True if the page number of the specified line is known.

       ?e     True if at end-of-file.

       ?f     True if there is an input filename (that is, if input is not a pipe).

       ?lX    True if the line number of the specified line is known.

       ?L     True if the line number of the last line in the file is known.

       ?m     True if there is more than one input file.

       ?n     True if this is the first prompt in a new input file.

       ?pX    True if the percent into the current input file, based  on  byte  offsets,  of  the
              specified line is known.

       ?PX    True  if  the  percent  into  the current input file, based on line numbers, of the
              specified line is known.

       ?s     Same as "?B".

       ?x     True if there is a next input file (that is, if the current input file is  not  the
              last one).

       Any  characters  other  than  the special ones (question mark, colon, period, percent, and
       backslash) become literally part of the prompt.  Any of  the  special  characters  may  be
       included in the prompt literally by preceding it with a backslash.

       Some examples:

       ?f%f:Standard input.

       This prompt prints the filename, if known; otherwise the string "Standard input".

       ?f%f .?ltLine %lt:?pt%pt\%:?btByte %bt:-...

       This  prompt  would  print  the  filename, if known.  The filename is followed by the line
       number, if known, otherwise the percent if known, otherwise  the  byte  offset  if  known.
       Otherwise,  a  dash  is printed.  Notice how each question mark has a matching period, and
       how the % after the %pt is included literally by escaping it with a backslash.

       ?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\: %x..%t";

       This prints the filename if this is the first prompt in a file, followed by the "file N of
       N"  message  if  there  is  more than one input file.  Then, if we are at end-of-file, the
       string "(END)" is printed followed by the  name  of  the  next  file,  if  there  is  one.
       Finally,  any  trailing spaces are truncated.  This is the default prompt.  For reference,
       here are the defaults for the other two prompts (-m and -M respectively).  Each is  broken
       into two lines here for readability only.

       ?n?f%f .?m(%T %i of %m) ..?e(END) ?x- Next\: %x.:
            ?pB%pB\%:byte %bB?s/%s...%t

       ?f%f .?n?m(%T %i of %m) ..?ltlines %lt-%lb?L/%L. :
            byte %bB?s/%s. .?e(END) ?x- Next\: %x.:?pB%pB\%..%t

       And here is the default message produced by the = command:

       ?f%f .?m(%T %i of %m) .?ltlines %lt-%lb?L/%L. .
            byte %bB?s/%s. ?e(END) :?pB%pB\%..%t

       The  prompt  expansion  features  are  also  used  for  another purpose: if an environment
       variable LESSEDIT is defined, it is used as the command to be executed when the v  command
       is  invoked.   The LESSEDIT string is expanded in the same way as the prompt strings.  The
       default value for LESSEDIT is:

            %E ?lm+%lm. %g

       Note that this expands to the editor name, followed by a + and the line  number,  followed
       by  the shell-escaped file name.  If your editor does not accept the "+linenumber" syntax,
       or has other differences in invocation syntax, the LESSEDIT variable  can  be  changed  to
       modify this default.

SECURITY

       When  the environment variable LESSSECURE is set to 1, less runs in a "secure" mode.  This
       means these features are disabled:

              !      the shell command

              |      the pipe command

              :e     the examine command.

              v      the editing command

              s  -o  log files

              -k     use of lesskey files

              -t     use of tags files

                     metacharacters in filenames, such as *

                     filename completion (TAB, ^L)

       Less can also be compiled to be permanently in "secure" mode.

COMPATIBILITY WITH MORE

       If the environment variable LESS_IS_MORE is set to 1, or if the program is invoked  via  a
       file link named "more", less behaves (mostly) in conformance with the POSIX "more" command
       specification.  In this mode, less behaves differently in these ways:

       The -e option works differently.  If the -e option is not set, less behaves as if  the  -e
       option were set.  If the -e option is set, less behaves as if the -E option were set.

       The  -m option works differently.  If the -m option is not set, the medium prompt is used,
       and it is prefixed with the string "--More--".  If the -m option is set, the short  prompt
       is used.

       The  -n  option  acts  like  the  -z  option.   The  normal  behavior  of the -n option is
       unavailable in this mode.

       The parameter to the -p option is taken to be a less command rather than a search pattern.

       The LESS environment variable is ignored, and the MORE environment variable is used in its
       place.

ENVIRONMENT VARIABLES

       Environment  variables may be specified either in the system environment as usual, or in a
       lesskey (1) file.  If environment variables are defined in more than one place,  variables
       defined  in  a  local  lesskey  file  take precedence over variables defined in the system
       environment, which take precedence over variables defined in the system-wide lesskey file.

       COLUMNS
              Sets the number of columns on the screen.  Takes  precedence  over  the  number  of
              columns  specified by the TERM variable.  (But if you have a windowing system which
              supports TIOCGWINSZ or WIOCGETD, the window system's idea of the screen size  takes
              precedence over the LINES and COLUMNS environment variables.)

       EDITOR The name of the editor (used for the v command).

       HOME   Name  of  the  user's  home directory (used to find a lesskey file on Unix and OS/2
              systems).

       HOMEDRIVE, HOMEPATH
              Concatenation of the HOMEDRIVE and HOMEPATH environment variables is  the  name  of
              the  user's  home  directory  if  the HOME variable is not set (only in the Windows
              version).

       INIT   Name of the user's init directory (used to find a lesskey file on OS/2 systems).

       LANG   Language for determining the character set.

       LC_CTYPE
              Language for determining the character set.

       LESS   Options which are passed to less automatically.

       LESSANSIENDCHARS
              Characters which may end an ANSI color escape sequence (default "m").

       LESSANSIMIDCHARS
              Characters which may appear between the ESC character and the end character  in  an
              ANSI color escape sequence (default "0123456789:;[?!"'#%()*+ ".

       LESSBINFMT
              Format for displaying non-printable, non-control characters.

       LESSCHARDEF
              Defines a character set.

       LESSCHARSET
              Selects a predefined character set.

       LESSCLOSE
              Command line to invoke the (optional) input-postprocessor.

       LESSECHO
              Name  of the lessecho program (default "lessecho").  The lessecho program is needed
              to expand metacharacters, such as * and ?, in filenames on Unix systems.

       LESSEDIT
              Editor prototype string (used for the v command).  See discussion under PROMPTS.

       LESSGLOBALTAGS
              Name of the command used by the -t option to find global tags.  Normally should  be
              set to "global" if your system has the global (1) command.  If not set, global tags
              are not used.

       LESSHISTFILE
              Name of the history file used  to  remember  search  commands  and  shell  commands
              between  invocations  of less.  If set to "-" or "/dev/null", a history file is not
              used.  The default is "$HOME/.lesshst" on Unix systems, "$HOME/_lesshst" on DOS and
              Windows systems, or "$HOME/lesshst.ini" or "$INIT/lesshst.ini" on OS/2 systems.

       LESSHISTSIZE
              The maximum number of commands to save in the history file.  The default is 100.

       LESSKEY
              Name of the default lesskey(1) file.

       LESSKEY_SYSTEM
              Name of the default system-wide lesskey(1) file.

       LESSMETACHARS
              List of characters which are considered "metacharacters" by the shell.

       LESSMETAESCAPE
              Prefix  which  less  will  add  before  each metacharacter in a command sent to the
              shell.  If LESSMETAESCAPE is an empty string,  commands  containing  metacharacters
              will not be passed to the shell.

       LESSOPEN
              Command line to invoke the (optional) input-preprocessor.

       LESSSECURE
              Runs less in "secure" mode.  See discussion under SECURITY.

       LESSSEPARATOR
              String to be appended to a directory name in filename completion.

       LESSUTFBINFMT
              Format for displaying non-printable Unicode code points.

       LESS_IS_MORE
              Emulate the more (1) command.

       LINES  Sets  the number of lines on the screen.  Takes precedence over the number of lines
              specified by the TERM variable.  (But if you have a windowing system which supports
              TIOCGWINSZ  or  WIOCGETD,  the  window  system's  idea  of  the  screen  size takes
              precedence over the LINES and COLUMNS environment variables.)

       MORE   Options which are passed to less automatically  when  running  in  more  compatible
              mode.

       PATH   User's search path (used to find a lesskey file on MS-DOS and OS/2 systems).

       SHELL  The shell used to execute the ! command, as well as to expand filenames.

       TERM   The type of terminal on which less is being run.

       VISUAL The name of the editor (used for the v command).

SEE ALSO

       lesskey(1)

COPYRIGHT

       Copyright (C) 1984-2019  Mark Nudelman

       less  is  part  of  the  GNU project and is free software.  You can redistribute it and/or
       modify it under the terms of either (1) the GNU General Public License as published by the
       Free  Software  Foundation;  or  (2)  the  Less  License.  See the file README in the less
       distribution for more details regarding redistribution.  You should have received  a  copy
       of  the  GNU  General Public License along with the source for less; see the file COPYING.
       If not, write to the Free Software Foundation, 59 Temple  Place,  Suite  330,  Boston,  MA
       02111-1307,  USA.   You should also have received a copy of the Less License; see the file
       LICENSE.

       less is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;  without
       even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
       GNU General Public License for more details.

AUTHOR

       Mark Nudelman
       Report bugs at https://github.com/gwsw/less/issues.
       For more information, see the less homepage at
       http://www.greenwoodsoftware.com/less.

                                     Version 551: 11 Jun 2019                             LESS(1)