V10/man/man1/comm.1

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.TH COMM 1 
.CT 1 files
.SH NAME
comm \- select or reject lines common to two sorted files
.SH SYNOPSIS
.B comm
[
.B -123
]
.I file1 file2
.SH DESCRIPTION
.I Comm
reads
.I file1
and
.I file2,
which are ordered in
.SM ASCII 
collating sequence,
and produces a three column output: lines only in
.IR file1 ;
lines only in
.IR file2 ;
and lines in both files.
The filename
.L -
means the standard input.
.PP
Flag
.LR 1 ,
.LR 2 ,
or
.LR 3
suppresses printing of the corresponding
column.
.SH EXAMPLES
.TP
.L
comm -12 file1 file2
Print lines common to two sorted files.
.TP
.L
deroff -w /usr/lib/upas/names.last | tr a-z A-Z | sort -u >temp
.br
.ns
.TP
.L
spell temp | comm -13 - temp
Print names that are known both to
.IR mail (1)
and
.IR spell (1)
.SH "SEE ALSO"
.IR sort (1),
.IR cmp (1), 
.IR diff (1), 
.IR uniq (1),
.IR join (1)