Unix Puzzle

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Across
  1. 4. a shell built-in command that operates on positional parameters
  2. 7. *,?
  3. 10. used to create directories of a file system
  4. 12. special pipe device file that provides temporary buffer
  5. 13. command that is used to display data in octal
  6. 14. search for a file pattern
  7. 15. listing file attributes
Down
  1. 1. heart of UNIX system
  2. 2. create, view, concatenate files
  3. 3. function that is used to retrieve file attributes
  4. 5. it is used to change the password
  5. 6. used to make variables that user cannot change
  6. 8. changes permissions specified in the command line
  7. 9. connect to commands together
  8. 11. used to delete files