Chapter 11. Using File Permissions and Access Control Lists
IN THIS CHAPTER
Because Unix is an inherently multiuser environment, it's important for there to be a way to record who owns what, who can look at it, run it, or change it. In Unix, this is accomplished with metadata flags that tell the system what permissions exist for each file. Because the system doesn't actually know a text file from a word processor, these flags are also used to indicate whether the file should be considered executable (and therefore a runnable program or application).
The basic philosophy of the Unix file permission system revolves around the idea ...
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