Octal permission values

Each permission for owner, group, and other has a unique octal value, as shown in the table below.

  Read Write Execute
POSIX owner

400

200

100

POSIX group

040

020

100

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).

With NFS, you can use these values to specify permissions.

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