Setting access modes

  • New files receive initial access mode as described by the umask.

  • The umask strips specified bits from the initial mode settings. Typical umasks are 002 and 022.

  • Existing file modes are changed using chmod with either symbolic or octal mode specifications:

    • Symbolic:

      [ugoa][-+=][rwxXst]
    • Octal bits:

      user r, w, x, group r, w, x, other r, w, x
      rwxrwxrwx = 111111111 = 777
      rwxr-xr-- = 111101100 = 751

chmod uses the following syntax:

chmod mode files

Modify the access mode on files using a symbolic or octal mode.

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