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File ownership and permission

Every file is owned by someone. Without the permission of the owner, no one can access the files except root.

Associated with each file are

You can use "ls -l" to view them.


# ls -l /bin/cp
-rwxr-xr-x   1   yuni  yuni   2334    Jul 6 2001  /bin/cp


The first column "-rwxr-xr-x" shows the file permissions of the file. This is a normal file as indicated by the dash "-" at the left most character. If it is character "d", this is a directory. The next 3 characters shows the owner's permission. "r" means readable, "w" means writable, and "x" means executable, "-" means none. The second and the third 3-character sets show the group and world permission.

Figure 1: Explanation of Unix file permission

User command used to manage file permissions are:


System Administrator
Thu Jul 26 11:24:05 HKT 2001