groups

Print group memberships for the current user

$ groups

Print group memberships for a specific user

$ groups [username]

Print group memberships for a list of users

$ groups [username1] [username2] [username3]

' groups 'u groups [ user ]

The groups command displays the current group names or ID values . If the value does not have a corresponding entry in /etc/group, the value will be displayed as the numerical group value . The optional user parameter will display the groups for the named user .

Systems which do not support concurrent group sets will have the information from /etc/group reported . The user must use newgrp or sg to change his current real and effective group ID .

/etc/group Group account information .

newgrp(1), getgid(2), getgroups(2), getuid(2).