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UNIX 2 - Coggle Diagram

- - - - Root
      - Home
      - Parent
      - Working
    - - Character special files
        
        I/O , Printers , Networks
      - Block special files
        
        Disk drives , Magnetic tapes
  - - - -l
      - -d
      - -i
      - -n
      - -r
  - - - -c
      - -d
      - -f
      - -s
- - - - Octal 4 for read
      - Octal 2 for write
      - Octal 1 for execute