Octal permission values

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Permissions are also represented by octal values. Each object has an octal permission value that’s the sum of the octal permission values specified for the object owner, the owning group, and all other users not in that group. The table below shows the value that corresponds to each permission.

  Read Write Execute
Owner 400 200 100
Group 040 020 010
Other 004 002 001

You can represent permissions numerically by combining these values. For example, the octal value 755 represents these permissions:

POSIX owner has read, write, and execute permissions (700).

POSIX group has read and execute permissions (050).

Other has read and execute permissions (005).