Common options
**************
Certain options are available in all these programs. Rather than
writing identical descriptions for each of the programs, they are
described here. (In fact, every GNU program accepts (or should accept)
these options.)
Many of these programs take arbitrary strings as arguments. In those
cases, `--help' and `--version' are taken as these options only if
there is one and exactly one command line argument.
`--help'
Print a usage message listing all available options, then exit
successfully.
`--version'
Print the version number, then exit successfully.