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 1, 2, or 3 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)

Plan 9  —  December 11, 1999