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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.