SysIII/usr/src/man/man1/comm.1

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.TH COMM 1
.SH NAME
comm \- select or reject lines common to two sorted files
.SH SYNOPSIS
.B comm
[
.B \-
[
.B 123
]
] file1 file2
.SH DESCRIPTION
.I Comm\^
reads
.I file1\^
and
.IR file2 ,
which
should be ordered in \s-1ASCII\s0 collating sequence (see
.IR sort (1)),
and produces a three-column output: lines only in
.IR file1 ;
lines only in
.IR file2 ;
and lines in both files.
The file name
.B \-
means the standard input.
.PP
Flags 1, 2, or 3 suppress printing of the corresponding
column.
Thus
.B comm
.B \-12
prints only the lines common to the two files;
.B comm
.B \-23
prints only lines in the first file but not in the second;
.B comm
.B \-123
is a no-op.
.PP
.SH "SEE ALSO"
cmp(1), diff(1), sort(1), uniq(1).