Unix programming Crossword Puzzle

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Across
  1. 5. Used to connect two or more commands
  2. 6. The command to know the Machine name
  3. 7. The command used to change the file owner
  4. 9. The filter in UNIX used to search for a pattern
  5. 10. The command used to create directories on a file system
Down
  1. 1. The original UNIX shell and also the Solaris default OS
  2. 2. How to remove the special meaning of Metacharacters (The Efficient method)
  3. 3. What must never be writable by group or others
  4. 4. The command used on a variable do that it's value cannot be changed
  5. 8. The command used to handle true or false values returned by evaluation of an expression