plan9 man page for comm

COMM(1) 						      General Commands Manual							   COMM(1)

NAME
       comm - select or reject lines common to two sorted files

SYNOPSIS
       comm [ -123 ] file1 file2

DESCRIPTION
       Comm  reads  file1  and	file2,	which are in lexicographical order, and produces a three column output: lines only in file1; lines only in
       file2; and lines in both files.	The file name means the standard input.

       Flag or suppresses printing of the corresponding column.

EXAMPLE
       comm -12 file1 file2

	      Print lines common to two sorted files.

SOURCE
       /sys/src/cmd/comm.c

SEE ALSO
       sort(1), cmp(1), diff(1), uniq(1)

																	   COMM(1)