Provided by: nmh_1.3-1build1_amd64 bug


       show - show (display) messages


       show [+folder] [msgs] [-draft] [-showproc program] [-showmimeproc program] [-header |
            -noheader] [-checkmime | -nocheckmime] [switches for showproc or showmimeproc]
            [-version] [-help]


       Show  lists  each  of  the  specified  messages  to  the  standard  output (typically, the

       By default, text (non-MIME) messages are filtered and displayed by the  nmh  command  mhl.
       This  command will display text messages in a nice, uniform format.  It also allows you to
       configure the format of the displayed messages and which headers fields  are  shown.   See
       the mhl(1) manual page for the details about this command.  This default can be changed by
       defining the showproc profile component.  Any switches not recognized by show  are  passed
       along  to  that  program.  To override the default and the showproc profile component, use
       the -showproc program switch.  For example, -showproc more will cause the more program  to
       list  the  messages  with  no  reformatting.   Normally,  this program is specified as the
       showproc in the user's .mh_profile, rather than using a command line switch.

       By default, non-text messages (MIME messages with multi-media contents) are processed  and
       displayed by the nmh command mhshow.  See the mhshow(1) manual page for details about this
       command.  This default can changed by defining the showmimeproc  profile  component.   Any
       switches  not  recognized  by  show  are  passed  along to that program.  To override this
       default and the showmimeproc profile component, use the -showmimeproc program switch.

       Note that in some cases, show may invoke the showmimeproc even for textual contents.  This
       will  happen  for  text  messages  that  specify a transfer encoding (such as MIME quoted-
       printable or base64) or specify a character set that show doesn't believe can be displayed
       natively.   The  environment  variable  $MM_CHARSET should be set to the terminal's native
       character set to avoid gratuitous invocations of the showmimeproc.  See the  mh-profile(5)
       man page for details about this environment variable.

       The option -checkmime (set by default) instructs show to test if any of the messages to be
       displayed are non-text (MIME) messages.  If any are non-text, they are  displayed  by  the
       program  showmimeproc,  else  they  are  displayed  by  the  program showproc.  The option
       -nocheckmime disables this test and instructs show to use showproc, regardless of  whether
       any of the messages are non-text (MIME) messages.

       The  -noshowproc  switch  will  disable  any  formatting  or  paging  of  messages.  It is
       equivalent to -nocheckmime -showproc cat.  It is still accepted, but should be  considered
       (somewhat) obsolete.

       If  the environment variable $NOMHNPROC is set, the test for non-text (MIME) messages will
       be disabled.  This method is obsolete.  Use the -nocheckmime switch instead.

       The -header switch tells show to display a  one-line  description  of  the  message  being
       shown.  This description includes the folder and the message number.

       If  no  `msgs'  are  specified,  the  current message is used.  Although it depends on the
       specific showproc or showmimeproc, in the default setup when  more  than  one  message  is
       specified,  you  will  be  prompted  for  a  <RETURN> prior to listing each message.  Each
       message will be listed a page at a time, and when the end of page is reached, the  program
       will  wait  for  a  <SPACE> or <RETURN>.  If a <RETURN> is entered, it will print the next
       line, whereas <SPACE> will print the next screenful.

       If the standard output is not a terminal, no queries are made, and  each  file  is  listed
       with a one-line header and two lines of separation.

       “show -draft” will list the file <mh-dir>/draft if it exists.

       If  the  profile  entry  “Unseen-Sequence” is present and non-empty, then show will remove
       each of the messages shown from each sequence named by the profile entry.


       $HOME/.mh_profile          The user profile


       Path:                To determine the user's nmh directory
       Current-Folder:      To find the default current folder
       Unseen-Sequence:     To name sequences denoting unseen messages
       showproc:            Program to show text (non-MIME) messages
       showmimeproc:        Program to show non-text (MIME) messages


       mhl(1), mhshow(1), more(1), next(1), prev(1), scan(1)


       `+folder' defaults to the current folder
       `msgs' defaults to cur


       If a folder is given, it will become the current folder.   The  last  message  shown  will
       become the current message.


       The  -header  switch  doesn't  work  when `msgs' expands to more than one message.  If the
       showproc is mhl, then this problem can be circumvented by  referencing  the  “messagename”
       field in the mhl format file.

       Show updates the user's context before showing the message.  Hence show will mark messages
       as seen prior to the user actually seeing them.  This is generally not a  problem,  unless
       the  user  relies  on  the  “unseen”  messages  mechanism, and interrupts show while it is
       showing “unseen” messages.

       If your showproc is mhl (the default), then show uses a built-in mhl: it does not actually
       run  the  mhl  program.   Hence, if you define your own showproc , don't call it mhl since
       show won't run it.

       If your showproc is the pager more, then avoid running show in the  background  with  only
       its standard output piped to another process, as in

            show | imprint &

       Due  to  a  bug  in  more,  show will go into a “tty input” state.  To avoid this problem,
       re-direct show's diagnostic output as well.  For users of csh:

            show |& imprint &

       For users of sh:

            show 2>&1 | imprint &