Differential D25344 Diff 75013 head/usr.bin/comm/comm.1

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	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT			.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY			.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF			.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	.\" SUCH DAMAGE.			.\" SUCH DAMAGE.
	.\"			.\"
	.\" From: @(#)comm.1 8.1 (Berkeley) 6/6/93			.\" From: @(#)comm.1 8.1 (Berkeley) 6/6/93
	.\" $FreeBSD$			.\" $FreeBSD$
	.\"			.\"
	.Dd December 12, 2009			.Dd July 27, 2020
	.Dt COMM 1			.Dt COMM 1
	.Os			.Os
	.Sh NAME			.Sh NAME
	.Nm comm			.Nm comm
	.Nd select or reject lines common to two files			.Nd select or reject lines common to two files
	.Sh SYNOPSIS			.Sh SYNOPSIS
	.Nm			.Nm
	.Op Fl 123i			.Op Fl 123i
	▲ Show 20 Lines • Show All 47 Lines • ▼ Show 20 Lines
	and			and
	.Ev LC_CTYPE			.Ev LC_CTYPE
	environment variables affect the execution of			environment variables affect the execution of
	.Nm			.Nm
	as described in			as described in
	.Xr environ 7 .			.Xr environ 7 .
	.Sh EXIT STATUS			.Sh EXIT STATUS
	.Ex -std			.Ex -std
				.Sh EXAMPLES
				Assuming a file named
				.Pa example.txt
				with the following contents:
				.Bd -literal -offset indent
				a
				b
				c
				d
				.Ed
				.Pp
				Show lines only in
				.Pa example.txt ,
				lines only in stdin and common lines:
				.Bd -literal -offset indent
				$ echo -e "B\enc" \| comm example.txt -
				B
				a
				b
				c
				d
				.Ed
				.Pp
				Show only common lines doing case insensitive comparisons:
				.Bd -literal -offset indent
				$ echo -e "B\enc" \| comm -1 -2 -i example.txt -
				b
				c
				.Ed
	.Sh SEE ALSO			.Sh SEE ALSO
	.Xr cmp 1 ,			.Xr cmp 1 ,
	.Xr diff 1 ,			.Xr diff 1 ,
	.Xr sort 1 ,			.Xr sort 1 ,
	.Xr uniq 1			.Xr uniq 1
	.Sh STANDARDS			.Sh STANDARDS
	The			The
	.Nm			.Nm
	utility conforms to			utility conforms to
	.St -p1003.2-92 .			.St -p1003.2-92 .
	.Pp			.Pp
	The			The
	.Fl i			.Fl i
	option is an extension to the			option is an extension to the POSIX standard.
	.Tn POSIX
	standard.
	.Sh HISTORY			.Sh HISTORY
	A			A
	.Nm			.Nm
	command appeared in			command appeared in
	.At v4 .			.At v4 .