COMM(1)                                                   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 ordered in ASCII col-
          lating sequence, 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 correspond-
          ing column.

     EXAMPLES
          comm -12 file1 file2
               Print lines common to two sorted files.

          deroff -w /mail/lib/names.last | tr a-z A-Z | sort -u >temp
          spell temp | comm -13 - temp
               Print names that are known both to mail(1) and spell(1)

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

     Page 1                       Plan 9             (printed 4/26/26)