Symbols can specify whose permissions are to be set or changed, the operation to be performed, and the permissions that are being assigned or changed. The following table lists the symbols for setting file permissions in symbolic mode. Table 16–6 Setting Special Permissions in Absolute Mode The following table lists the octal values to set special permissions on a file. In absolute mode, you set special permissions by adding a new octal value to the left However, you cannot set or remove setuid permissions on a directory by using absolute mode. You can set special permissions on a file in absolute or symbolic modes. Table 16–5 Setting File Permissions in Absolute Mode For example, the value 644 sets read and write permissions for owner, and read-only permissions for groupĪnd other. You use these numbers in sets of three to set permissions for owner, group, and other (in that order). The following table lists the octal values for setting file permissions in absolute mode. Symbolic Mode – Use combinations of letters and symbols to add or remove permissions. When you change permissions by using the absolute mode, you represent permissions for each triplet by an octal mode number.
You can use the chmod command to set permissions in either of two modes:Ībsolute Mode – Use numbers to represent file permissions (the method most commonly used to set permissions).
You must be superuser or the owner of a file or directory to change its permissions. The chmod command enables you to change the permissions on a file.
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