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More on File Permissions

More on File Permissions

What you can and can't do with a file, as defined by your user or group name, is pretty much wrapped up in four little letters. Each of these letters in turn can be referenced by a number. They are r, w, x, and s. Their numerical representations are 4, 2, 1, and “it depends.” To understand all that, you need to do a little binary math.

Reading from right to left, think of the x as being in position zero. The w, then, is in position 1, and the r is in position 2. Here's the way it works:


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