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You use the chmod command to change different permission configurations chmod takes two lists as its arguments: permission changes and filenames You can specify the list of permissions in two different ways One way uses permission symbols and is referred to as the symbolic method The other uses what is known as a binary mask and is referred to as either the absolute or the relative method Table 28-5 lists options for the chmod command
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NOTE When a program is owned by the root, setting the user ID permission will give the user the
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ability to execute the program with root permissions This can be a serious security risk for any program that can effect changes such as rm, which removes files
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Files and directories belong to both an owner and a group A group usually consists of a collection of users, all belonging to the same group In the following example, the mydata file is owned by the user robert and belongs to the group weather:
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-rw-r--r-- 1 robert weather 207 Feb 20 11:55 mydata
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Command or Option chmod Options + = r
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Execution Changes the permission of a file or directory
Adds a permission Removes a permission Assigns entire set of permissions Sets read permission for a file or directory A file can be displayed or printed A directory can have the list of its files displayed Sets write permission for a file or directory A file can be edited or erased A directory can be removed Sets execute permission for a file or directory If the file is a shell script, it can be executed as a program A directory can be changed to and entered Sets permissions for the user who created and owns the file or directory Sets permissions for group access to a file or directory Sets permissions for access to a file or directory by all other users on the system Sets permissions for access by the owner, group, and all other users Sets User ID and Group ID permission; program owned by owner and group Sets sticky bit permission; program remains in memory
u g o a s t Commands chgrp groupname filenames chown user-name filenames ls -l filename ls -ld directory ls -l
Changes the group for a file or files Changes the owner of a file or files Lists a filename with its permissions displayed Lists a directory name with its permissions displayed Lists all files in a directory with its permissions displayed
TABLE 28-5 File and Directory Permission Operations
A group can also consist of one user, normally the user who creates the file Each user on the system, including the root user, is assigned his or her own group of which he or she is the only member, ensuring access only by that user In the next example, the report file is owned by the robert user and belongs to that user s single user group, robert:
-rw-r--r-- 1 robert robert 305 Mar 17 12:01 report
28:
Managing Users
The root user, the system administrator, owns most of the system files that also belong to the root group, of which only the root user is a member Most administration files, like configuration files in the /etc directory, are owned by the root user and belong to the root group Only the root user has permission to modify them, whereas normal users can read and, in the case of programs, also execute them In the next example, the root user owns the fstab file in the /etc directory, which also belongs to the root user group
-rw-r--r-- 1 root root 621 Apr 22 11:03 fstab
PART VII PART I PART I PART I PART I PART I PART I
Certain directories and files located in the system directories are owned by a service, rather than the root user, because the services need to change those files directly This is particularly true for services that interact with remote users, such as Internet servers Most of these files are located in the /var directory Here you will find files and directories managed by services like the Squid proxy server and the Domain Name Server (named) In this example, the Squid proxy server directory is owned by the squid user and belongs to the squid group:
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