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.TH COMM 1
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.CT 1 files
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.SH NAME
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comm \- select or reject lines common to two sorted files
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.SH SYNOPSIS
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.B comm
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[
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.B -123
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]
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.I file1 file2
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.SH DESCRIPTION
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.I Comm
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reads
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.I file1
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and
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.IR file2 ,
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which are in lexicographical order,
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and produces a three column output: lines only in
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.IR file1 ;
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lines only in
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.IR file2 ;
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and lines in both files.
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The file name
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.L -
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means the standard input.
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.PP
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Flag
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.LR 1 ,
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.LR 2 ,
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or
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.LR 3
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suppresses printing of the corresponding
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column.
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.SH EXAMPLE
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.TP
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.EX
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comm -12 file1 file2
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.EE
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.IP
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Print lines common to two sorted files.
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.SH SOURCE
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.B /sys/src/cmd/comm.c
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.SH "SEE ALSO"
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.IR sort (1),
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.IR cmp (1),
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.IR diff (1),
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.IR uniq (1)