This is similar to PHP's array_diff and Java's removeAll(). Helpful in finding diffs between lists of ids.

angelcool@fedora-laptop$cat FILE1.txt 
1
2
3
4
5
5
angelcool@fedora-laptop$cat FILE2.txt 
1
2
3
4
5
6
7
8
9
angelcool@fedora-laptop$comm -13 <(sort FILE1.txt|uniq) <(sort FILE2.txt|uniq)
6
7
8
9
angelcool@fedora-laptop$ man comm
...
       Compare sorted files FILE1 and FILE2 line by line.

       When FILE1 or FILE2 (not both) is -, read standard input.

       With  no  options,  produce three-column output.  Column one contains lines unique to FILE1, column two con‐
       tains lines unique to FILE2, and column three contains lines common to both files.

       -1     suppress column 1 (lines unique to FILE1)

       -2     suppress column 2 (lines unique to FILE2)

       -3     suppress column 3 (lines that appear in both files)

       --check-order
              check that the input is correctly sorted, even if all input lines are pairable

       --nocheck-order
              do not check that the input is correctly sorted

       --output-delimiter=STR
              separate columns with STR

       --total
              output a summary

       -z, --zero-terminated
              line delimiter is NUL, not newline

       --help display this help and exit

       --version
              output version information and exit

       Note, comparisons honor the rules specified by 'LC_COLLATE'.
...

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