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GROUP(5) File Formats Manual GROUP(5)

group - group file

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.

/etc/group

newgrp(1), crypt(3), passwd(1), passwd(5)

UNIX-7