GROUP(5) — Unix Programmer’s Manual
NAME
group − group file
DESCRIPTION
Group contains for each group the following information:
group name
encrypted password
numerical group ID
a comma separated list of all users allowed in the group
This is an ASCII file. The fields are separated by colons; Each group is separated from the next by a new-line. If the password field is null, no password is demanded.
This file resides in directory /etc. Because of the encrypted passwords, it can and does have general read permission and can be used, for example, to map numerical group ID’s to names.
FILES
/etc/group
SEE ALSO
newgrp(1), crypt(3), passwd(1), passwd(5)
BUGS
The passwd(1) command won’t change the passwords.
7th Edition