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UNIX in a Nutshell: System V Edition

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UNIX Commands
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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. But comm can also 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-ten movies, and display items that appear in both lists:



comm -12 siskel_top10 ebert_top10


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