Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 11-05-2007, Installation Manual

Page: 364 / 982

1. Users concerned
•
u
(user)—owner of the file
•
g
(group)—group that owns the file
•
o
(others)—additional users (if no parameter is given, the changes apply to all
categories)
2. A character for deletion (
–
), setting (
=
), or insertion (
+
)
3. The abbreviations
•
r
—read
•
w
—write
•
x
—execute
4. Filename or filenames separated by spaces
If, for example, the user
tux
in Example 17.2, “Sample Output Showing Directory
Permissions” (page 345) also wants to grant other users write (
w
) access to the di-
rectory
ProjectData
, he can do this using the command
chmod o+w
ProjectData
.
If, however, he wants to deny all users other than himself write permissions, he
can do this by entering the command
chmod go-w ProjectData
. To prohibit
all users from adding a new file to the folder
ProjectData
, enter
chmod -w
ProjectData
. Now, not even the owner can create a new file in the directory
without first reestablishing write permissions.
Changing Ownership Permissions
Other important commands to control the ownership and permissions of the file
system components are
chown
(change owner) and
chgrp
(change group). The
command
chown
can be used to transfer ownership of a file to another user.
However, only
root
is permitted to perform this change.
Suppose the file
Roadmap
from Example 17.2, “Sample Output Showing Directory
Permissions” (page 345) should no longer belong to
tux
, but to the user
geeko
.
root
should then enter
chown geeko Roadmap
.
346 Installation and Administration