Unix crossword

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Across
  1. 3. command to remove a directory.
  2. 4. command to show the current date and time.
  3. 6. command to print.
  4. 8. command for mannual.
  5. 9. permission changing command.
  6. 12. purpose of ls command is ?
  7. 14. _______is loaded into memory when the system is booted.
Down
  1. 1. command used to search text and strings in a given file.
  2. 2. the ls command with the -a flag views ______files.
  3. 5. command to show current directory.
  4. 7. a way of representing permissions.
  5. 8. command to create a directory.
  6. 10. rename command.
  7. 11. command to show calendar of the current month.
  8. 13. _______is an interface that interprets the command line input and calls the necessary programs to do the work.