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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.
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A simple way to calculate the octal number makes use of the fact that any number used for permissions will be a combination derived from adding in decimal terms the numbers 4, 2, and 1. Use 4 for read permission, 2 for write, and 1 for execute. The read, write, execute permission is simply the addition of 4 + 2 + 1 to get 7. The read and execute permission adds 4 and 1, to get 5. You can use this method to calculate the octal number for each category. To get 755, you would add 4 + 2 + 1 for the owner read, write, and execute permission; 4 + 1 for the group read and execute permission; and 4 + 1 again for the other read and execute permission.
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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 and 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 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. $ chmod 544 mydata
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One of the most common uses of the binary mask is to set the execute permission. You can create files that contain Linux commands, called shell scripts. To execute the commands in a shell script, you must first indicate the file is executable that it contains commands the system can execute. You can do this in several ways, one of which is to set the executable permission on the shell script file.
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Suppose you just completed a shell script file and you need to give it executable permission to run it. You also want to retain read and write permission, but deny any access by the group or other users. The octal digit 7 (111) will set all three permissions, including execute (you can also add 4-read, 2-write, and 1-execute to get 7). Using 0 for the group and other users denies them access. This gives you the digits 700, which are equivalent to the binary digits 111 000 000. In this example, the owner permission for the myprog file is set to include execute permission: $ chmod 700 myprog If you want others to be able to execute and read the file, but not change it, you can set the read and execute permissions and turn off the write permission with the digit 5 (101). In this case, you would use the octal digits 755, having the binary equivalent of 111 101 101. $ chmod 755 myprog
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Setting Permissions: Permission Symbols
The symbolic method of setting permissions uses the characters r, w, and x for read, write, and execute, respectively. Any of these permissions can be added or removed. The symbol to add a permission is the plus sign, +. The symbol to remove a permission is the minus sign, -. In the next example, the chmod command adds the execute permission and removes the write permission for the mydata file for all categories. The read permission is not changed. $ chmod +x-w mydata Permission symbols also specify each user category. The owner, group, and others categories are represented by the u, g, and o characters, respectively. Notice the owner category is represented by a u, and can be thought of as the user. The symbol for a category is placed before plus
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