comm

comm [options ] file1 file2

Compare lines common to the sorted files file1 and file2 . Three-column output is produced: lines unique to file1 , lines unique to file2 , and lines common to both files . comm is similar to diff in that both commands compare two files. In addition, comm can be used like uniq ; that is, comm selects duplicate or unique lines between two sorted files, whereas uniq selects duplicate or unique lines within the same sorted file.

Options

-

Read the standard input.

-1

Suppress printing of Column 1.

-2

Suppress printing of Column 2.

-3

Suppress printing of Column 3.

-12

Print only lines in Column 3 (lines common to file1 and file2 ).

-13

Print only lines in Column 2 (lines unique to file2 ).

-23

Print only lines in Column 1 (lines unique to file1 ).

Example

Compare two lists of top-10 movies and display items that appear in both lists:

comm -12 shalit_top10 maltin_top10