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(libc.info)Argp User Customization

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Argp User Customization
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   The formatting of argp `--help' output may be controlled to some
extent by a program's users, by setting the `ARGP_HELP_FMT' environment
variable to a comma-separated list of tokens.  Whitespace is ignored:

`dup-args'
`no-dup-args'
     These turn "duplicate-argument-mode" on or off.  In duplicate
     argument mode, if an option that accepts an argument has multiple
     names, the argument is shown for each name.  Otherwise, it is only
     shown for the first long option.  A note is subsequently printed
     so the user knows that it applies to other names as well.  The
     default is `no-dup-args', which is less consistent, but prettier.

`dup-args-note'

`no-dup-args-note'
     These will enable or disable the note informing the user of
     suppressed option argument duplication.  The default is
     `dup-args-note'.

`short-opt-col=N'
     This prints the first short option in column N.  The default is 2.

`long-opt-col=N'
     This prints the first long option in column N.  The default is 6.

`doc-opt-col=N'
     This prints `documentation options' (Note: Argp Option Flags) in
     column N.  The default is 2.

`opt-doc-col=N'
     This prints the documentation for options starting in column N.
     The default is 29.

`header-col=N'
     This will indent the group headers that document groups of options
     to column N.  The default is 1.

`usage-indent=N'
     This will indent continuation lines in `Usage:' messages to column
     N.  The default is 12.

`rmargin=N'
     This will word wrap help output at or before column N.  The default
     is 79.