man > show(1mh)

SHOW(1mh)                                                                                  SHOW(1mh)

NAME
       show - display nmh messages

SYNOPSIS


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

DESCRIPTION
       show lists each of the specified messages to the standard output (typically, the terminal).

       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 config‐
       ure 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, as well as -header and -no‐
       header, 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 appropriate locale(1) environment variables should be set to the terminal's native  char‐
       acter  set  to  avoid  gratuitous invocations of the showmimeproc.  See locale(1) for details
       about these environment variables.

       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 pro‐
       gram 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 mes‐
       sages 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) ob‐
       solete.

       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.

       By default show will concatenate all content under one pager.  If you want each part to  dis‐
       played separately, you can override the default behavior with -noconcat.

       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.

FILES
       $HOME/.mh_profile          The user profile

PROFILE COMPONENTS
       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

SEE ALSO
       mhl(1), mhshow(1), next(1), prev(1), scan(1)

DEFAULTS
       `+folder' defaults to the current folder
       `msgs' defaults to cur
       `-checkmime'
       `-header'
       `-concat'

CONTEXT
       If  a folder is given, it will become the current folder.  The last message selected will be‐
       come the current message.

BUGS
       The -header switch doesn't work when `msgs' expands to more than one message.  If  the  show‐
       proc  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 “un‐
       seen” 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-di‐
       rect show's diagnostic output as well.  For users of csh:

            show |& imprint &

       For users of sh:

            show 2>&1 | imprint &

nmh-1.8                                      2016-03-24                                    SHOW(1mh)