Manual pages › General commands (1)
comm-original(1)
select or reject lines common to two sorted files
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
With the coreutil package (with the extra set), see comm(1) instead.
NAME
comm - select or reject lines common to two sorted files
SYNOPSIS
comm [ - [ 123 ] ] file1 file2
DESCRIPTION
comm reads file1 and file2, which should be ordered in ASCII collating sequence [see sort(1)], 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.
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 prints nothing.
SEE ALSO
cmp(1), diff(1), sort(1), uniq(1).