@(#)comm.1 6.1 (Berkeley) 04/29/85

.AT 3 comm - select or reject lines common to two sorted files comm [ - [ 123 ] ] file1 file2 Comm reads file1 and file2, which should be ordered in ASCII collating sequence, and produces a three column output: lines only in file1; lines only in file2; and lines in both files. The filename `-' means the standard input.

Flags 1, 2, or 3 suppress printing of the corresponding column. Thus comm -12 prints only the lines common to the two files; comm -23 prints only lines in the first file but not in the second; comm -123 is a no-op.

cmp(1), diff(1), uniq(1)