checkgid (8) - Linux Man Pages
checkgid: checks the gid
checkgid - checks the gid
DESCRIPTIONThis manual page documents briefly the checkgid command.
checkgid is a program that checks whether it can setgid to the group specified. This is to see if it is a valid group for apache2 to use at runtime. If the user (should be run as superuser) is in that group, or can setgid to it, it will return 0.
AUTHORThis manual page was written by Daniel Stone <daniel [at] sfarc.net> for the Debian GNU/Linux distribution, as the original did not have a manpage.