groups(1) — USER COMMANDS
NAME
groups − display a user’s group memberships
SYNOPSIS
/usr/ucb/groups [ user . . . ]
DESCRIPTION
With no arguments, groups displays the groups to which you belong; else it displays the groups to which the user belongs. Each user belongs to a group specified in the password file /etc/passwd and possibly to other groups as specified in the file /etc/group. If you do not own a file but belong to the group which it is owned by then you are granted group access to the file.
FILES
/etc/passwd
/etc/group
SEE ALSO
NOTES
This command is obsolescent.
— BSD Compatibility Package