Listing group membership of a user or members of a group in Linux

lid is a handy command-line tool for getting group membership of a user or list of users a group contains.

If you invoke lid just without any option, it will list groups containing the invoking user.

# lid

No user name specified, using root.

root(gid=0)

bin(gid=1)

daemon(gid=2)

sys(gid=3)

adm(gid=4)

disk(gid=6)

wheel(gid=10)

By default lid lists groups containing user name.

# lid mysql

mysql(gid=27)

with -g option lid lists users in a group.

# lid -g users

games(uid=12)

If you don't want to display user or group IDs then you should use -n or --onlynames options.

# lid -g -n bin

bin

root

daemon