COMM(1)                              BSD                               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 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.  If you specify a dash (-) in
     place of a filename, comm reads 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.

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