grog --version (return code: 0)
Perl version of GNU grog in groff version 1.22.3
grog --help (return code: 0)
usage: grog [option]... [--] [filespec]... "filespec" is either the name of an existing, readable file or "-" for standard input. If no `filespec' is specified, standard input is assumed automatically. All arguments after a `--' are regarded as file names, even if they start with a `-' character. `option' is either a `groff' option or one of these: -h|--help print this uasge message and exit -v|--version print version information and exit -C compatibility mode --ligatures include options `-P-y -PU' for internal font, which preserverses the ligatures like `fi' --run run the checked-out groff command --warnings display more warnings to standard error All other options should be `groff' 1-character options. These are then appended to the generated `groff' command line. The `-m' options will be checked by `grog'.