[Introduction to UNIX for Web Developers]
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Okay, so in our discussion of the ls -l option, we promised to explain what we meant by permissions, owner and group. Well here we go...

Permissions are a basic part of the UNIX security system. In short, they define who gets to do what with which files.

Specifically, permissions define who gets to:

  • Read a File
  • Modify or delete a file
  • Execute a file (if it is a program)

Your access privileges are defined in the password and group files. Before we get into the nitty gritty of permissions, let's take a look at these files.

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