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# chmod +s /usr/sbin/pppd
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The Set User ID and Set Group ID permissions show up as an s in the execute position of the owner and group segments. Set User ID and Group ID are essentially variations of the execute permission, x. Read, write, and User ID permission would be rws instead of just rwx.
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# ls -l /usr/sbin/pppd -rwsr-sr-x 1 root root 84604 Aug 14 1996 /usr/sbin/pppd
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One other special permission provides efficient use of programs. The sticky bit instructs the system to keep a program in memory (on a swap device) after it finishes execution. This is useful for small programs used frequently by many users. The sticky bit permission is t. The sticky bit shows up as a t in the execute position of the other permissions. A program with read and execute permission with the sticky bit would have its permissions displayed as r-t.
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# chmod +t /usr/X11R6/bin/xtetris
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# ls -l /usr/X11R6/bin/xtetris -rwxr-xr-t 1 root root 27428 Nov 19 1996 /usr/X11R6/bin/xtetris
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Instead of permission symbols, many users find it more convenient to use the absolute method. The absolute method changes all the permissions at once, instead of specifying one or the other. It uses a binary mask that references all the permissions in each category. The three categories, each with three permissions, conform to an octal binary format. Octal numbers have a base 8 structure. When translated into a binary number, each octal digit becomes three binary digits. A binary number is a set of 1 and 0 digits. Three octal digits in a number translate into three sets of three binary digits, which is nine altogether-and the exact number of permissions for a file. You can use the octal digits as a mask to set the different file permissions. Each octal digit applies to one of the user categories. You can think of the digits matching up with the permission categories from left to right, beginning with the owner category. The first octal digit applies to the owner category, the second to the group, and the third to the others category. The actual octal digit you choose determines the read, write, and execute permissions for each category. At this point, you need to know how octal digits translate into their binary equivalents. The following table shows how the different octal digits, 0-7, translate into their three-digit binary equivalents. You can think of the octal digit first being translated into its binary form, and then each of those three binary digits being used to set the read, write, and execute permissions. Each binary digit is then matched up with a corresponding permission, again moving from left to right. If a binary digit is 0, the permission is turned off. If the binary digit is 1, the permission is turned on. The first binary digit sets the read permission on or off, the second sets the write permission, and the third sets the execute permission. For example, an octal digit 6 translates into the binary digits 110. This would set the read and write permission on, but set the execute permission off. Octal 0 1 2 3 4 5 6 7 Binary 000 001 010 011 100 101 110 111
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When dealing with a binary mask, you need to specify three digits for all three categories, as well as their permissions. This makes a binary mask less versatile than the permission symbols. To set the owner execute permission on and the write permission off for the mydata file, as well as retain the read permission, you need to use the octal digit 5 (101). At the same time, you need to specify the digits for group and other users access. If these categories are to
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retain read access, you need the octal number 4 for each (100). This gives you three octal digits, 544, which translate into the binary digits 101 100 100.
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