Linux

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Across
  1. 2. opens simple text editor
  2. 5. shows first
  3. 6. shows running processes
  4. 9. clears terminal
  5. 12. kills process
  6. 14. displays username of current user
  7. 15. removes empty directory
  8. 19. creates directory
Down
  1. 1. creates an empty file or updates timestamp
  2. 3. shows last few lines of files
  3. 4. copies files and directories
  4. 7. executes commands with administrator privileges
  5. 8. displays contents of file
  6. 9. changes file permissions
  7. 10. displays past executed commands
  8. 11. prints the current directory
  9. 13. lists contents of a directory
  10. 16. moves/renames files and directories
  11. 17. removes files and directories
  12. 18. changes the current directory