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Index: head/usr.bin/comm/comm.1
===================================================================
--- head/usr.bin/comm/comm.1
+++ head/usr.bin/comm/comm.1
@@ -31,7 +31,7 @@
.\" From: @(#)comm.1 8.1 (Berkeley) 6/6/93
.\" $FreeBSD$
.\"
-.Dd December 12, 2009
+.Dd July 27, 2020
.Dt COMM 1
.Os
.Sh NAME
@@ -95,6 +95,35 @@
.Xr environ 7 .
.Sh EXIT STATUS
.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
.Xr cmp 1 ,
.Xr diff 1 ,
@@ -108,9 +137,7 @@
.Pp
The
.Fl i
-option is an extension to the
-.Tn POSIX
-standard.
+option is an extension to the POSIX standard.
.Sh HISTORY
A
.Nm

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