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.