COMM(1) General Commands Manual COMM(1)
comm - display lines in common, and lines not in common, between two
comm [ -1| -2| -3| -12| -13| -23 ] filename1 filename2
comm reads filename1 and filename2, which should be ordered in ASCII
collating sequence (see sort(1V)), and produces three-column output
when no options are specified:
o Column 1 contains lines that occur only in filename1.
o Column 2 contains lines only in filename2.
o Column 3 contains lines common to both files.
The filename `-' means the standard input.
The following options can be used to suppress the indicated columns
from display. You can specify `-123', but doing so suppresses all out-
-1 Suppress column 1; omit lines only in filename1.
-2 Suppress column 2; omit lines only in filename2.
-3 Suppress column 3; omit lines common to both files.
-12 Suppress columns 1 and 2; only show lines common to both files.
-13 Suppress columns 1 and 3; only show lines in filename2.
-23 Suppress columns 2 and 3; only show lines in filename1.
cmp(1), diff(1), sort(1V), uniq(1)
The options suppress, rather than select the columns you indicate.
9 September 1987 COMM(1)