3.1.1.1 Common options

-?

-h

--help

Print a short usage message listing only some few of all available options, then exit successfully.

-??

-hh

--usage[=argument]

--long-help[=argument]

Print an extended usage message listing all available options, then exit successfully. If an argument is given and it is a valid long-style option name, an extended help text related to the given long-style option name is displayed only, e.g.:

--long-help=long-help

displays the extended help text for the long option --long-help.

If the argument only consists of the single ‘?’ character or is no valid long-style option name, a list of all valid long-style option names is displayed.

-L

--license

--copyleft

--copyright

Print the software license message, then exit successfully.

-V

--version

Print the version number and compilation options, then exit successfully.

--exit-status-help-non-zero

Set the exit state of program to 127 instead to 0, if one of the other options of the common option class is used.