1 .TH COMM 1 
2 .CT 1 files
3 .SH NAME
4 comm \- select or reject lines common to two sorted files
5 .SH SYNOPSIS
6 .B comm
7 [
8 .B -123
9 ]
10 .I file1 file2
11 .SH DESCRIPTION
12 .I Comm
13 reads
14 .I file1
15 and
16 .IR file2 ,
17 which are in lexicographical order,
18 and produces a three column output: lines only in
19 .IR file1 ;
20 lines only in
21 .IR file2 ;
22 and lines in both files.
23 The file name
24 .L -
25 means the standard input.
26 .PP
27 Flag
28 .LR 1 ,
29 .LR 2 ,
30 or
31 .LR 3
32 suppresses printing of the corresponding
33 column.
34 .SH EXAMPLE
35 .TP
36 .EX
37 comm -12 file1 file2
38 .EE
39 .IP
40 Print lines common to two sorted files.
41 .SH SOURCE
42 .B \*9/src/cmd/comm.c
43 .SH "SEE ALSO"
44 .MR sort (1) ,
45 .IR cmp (1), 
46 .IR diff (1), 
47 .MR uniq (1)