jack -V (return code: 1)
This is jack 3.1.1 (C)2004 Arne Zellentin <zarne@users.sf.net>
*warning* You have no standard location set, putting files into the current
directory. Please consider setting base_dir in ~/.jack3rc.
*warning* Default CD device /dev/cdrom does not exist, using /dev/sr0.
*error* can't determine your username, please set it manually.
jack --help (return code: 0)
This is jack 3.1.1 (C)2004 Arne Zellentin <zarne@users.sf.net>
usage: jack [option]...
--debug show debug information [no]
--quality vbr encoding quality. -1 is lowest, 10 highest. [6]
--query, -q do freedb query when all is done
--query-if-needed query freedb when starting if not queried already [no]
--query-now, -Q do freedb query when starting
--rename, -R rename according to freedb file, eg. after editing it
--vbr, -v generate variable bitrate files [yes] +
These are the most common options. For a complete list, run jack --longhelp