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One of the most common uses of the binary mask is to set the execute permission. As you learned in 11, you can create files that contain Linux commands; these files are called shell scripts. To have the commands in a shell script executed, 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. 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 4read, 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 the next example, the owner permission for the myprog file is set to include execute permission:
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$ chmod 700 myprog
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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.
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$ chmod 755 myprog
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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 user 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. For the ownership and sticky bit permissions, you add another octal number to the beginning of the octal digits. The octal digit for User ID permission is 4 (100); for Group ID, it is 2 (010); and for the sticky bit, it is 1 (001). The following example sets the User ID permission to the pppd program, along with read and execute permissions for the owner, group, and others:
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# chmod 4555 /usr/sbin/pppd
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The following example sets the sticky bit for the xtetris program:
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# chmod 1755 /usr/X11R6/bin/xtetris
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The next example would set both the sticky bit and the User ID permission on the xman program. The permission 5755 has the binary equivalent of 101 111 101 101.
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# chmod 5755 /usr/X11R6/bin/xman
# ls -l /usr/X11R6/bin/xman -rwsr-xr-t 1 root root 44364 Mar 26 04:28 /usr/X11R6/bin/xman
Directory Permissions
You can also set permissions on directories. The read permission set on a directory allows the list of files in a directory to be displayed. The execute permission enables a user to change to that directory. The write permission enables a user to create and remove his or her files in that directory. If you allow other users to have write permission on a directory, they can add their own files to it. When you create a directory, it is automatically given read, write, and execute permission for the owner. You may list the files in that directory, change to it, and create files in it. Like files, directories have sets of permissions for the owner, the group, and all other users. Often, you may want to allow other users to change to and list the files in one of your directories, but not let them add their own files to it. In this case, you would set read and execute permissions on the directory, but not write permission. This would allow other users to change to the directory and list the files in it, but not to create new files or to copy any of their files into it. The next example sets read and execute permission for the group for the thankyou directory, but removes the write permission. Members of the group may enter the thankyou directory and list the files there, but they may not create new ones.
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