Group Management
groups
|
Print the group membership of a user. |
groupadd
|
Create a group. |
groupdel
|
Delete a group. |
groupmod
|
Modify a group. |
A group is a set of accounts treated as a
single entity. If you give permission for a group to take some action
(such as modify a file), then all members of that group can take it. For
example, you can give full permissions for the group friends
to read, write, and execute the file
/tmp/sample:
$ groups users smith friends $ chgrp friends /tmp/sample $ chmod 770 /tmp/sample $ ls -l /tmp/sample -rwxrwx--- 1 smith friends 2874 Oct 20 22:35 /tmp/sample
To add users to a group, edit /etc/group as root.[18] To change the group ownership of a file, recall the
chgrp
commands from File Properties.
[18] Different systems may store the group member list in other ways.
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