1. # diff [OPTION]... FILES
    2. # compare files line by line, and show the differences
    4. # -i
    5. # –ignore-case —Ignores case differences in file contents
    7. # -b
    8. # –ignore-space-change —Ignores changes in the amount of white space
    10. # -w
    11. # –ignore-all-space —Ignores all white space
    13. # -q
    14. # --brief —Outputs only whether the files differ
    16. # -l
    17. # --paginate —Passes the output through pr to paginate it
    20. # comm [OPTION]... FILE1 FILE2
    21. # compare two sorted files line by line
    22. # -1 —Suppresses the output of column 1 (lines only in file1)
    23. # -2 —Suppresses the output of column 2 (lines only in file2)
    24. # -3 —Suppresses the output of column 3 (lines that are in both files)