Common options

`-?'

`-h'

`--help'

Print a short usage message listing most 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 a 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-127'

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

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