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.Dd March 27, 2015
.Dt COMM 1
.Os sbase
.Sh NAME
.Nm comm
.Nd select or reject lines common to two files
.Sh SYNOPSIS
.Nm
.Op Fl 123
.Ar file1
.Ar file2
.Sh DESCRIPTION
.Nm
reads
.Ar file1
and
.Ar file2,
which should both be sorted lexically, and writes three text columns
to stdout:
.Bl -tag -width Ds
.It 1
Lines only in
.Ar file1 .
.It 2
Lines only in
.Ar file2 .
.It 3
Common lines.
.El
.Sh OPTIONS
.Bl -tag -width Ds
.It Fl 1 | Fl 2 | Fl 3
Suppress column 1 | 2 | 3
.El
.Sh SEE ALSO
.Xr cmp 1 ,
.Xr sort 1 ,
.Xr uniq 1
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2013
specification.