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BSD 2.11 - man page for groups (bsd section 1)

GROUPS(1)						      General Commands Manual							 GROUPS(1)

NAME
groups - show group memberships
SYNOPSIS
groups [user]
DESCRIPTION
The groups command shows the groups to which you or the optionally specified user belong. 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. When a new file is created it is given the group of the containing directory.
SEE ALSO
setgroups(2)
FILES
/etc/passwd, /etc/group
BUGS
More groups should be allowed. 4.2 Berkeley Distribution April 29, 1985 GROUPS(1)