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What are permissions?

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Every Unix file has a set of permissions associated with it that specify who is allowed to use that file and in what way.

There are three kinds of permissions:

  1. A read permission means someone can see what is in the file.
  2. A write permission means someone can change what is in the file, or even remove it.
  3. An execute permission means someone can run (execute) a file, if that file contains a program.
Permissions are granted to three kinds of users:
Next: Finding a file's permissions
See also: Controlling access to your files; Changing file permissions
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John Shipman,
Last updated: 1995/12/04 19:39:34 UT
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