NAME
comm
- select or reject lines common to two files
SYNOPSIS
comm
[-123f]
file1 file2
DESCRIPTION
The
comm
utility reads
file1
and
file2,
which should be
sorted lexically, and produces three text
columns as output: lines only in
file1;
lines only in
file2;
and lines in both files.
The filename ``-'' means the standard input.
The following options are available:
- -1
-
Suppress printing of column 1.
- -2
-
Suppress printing of column 2.
- -3
-
Suppress printing of column 3.
- -f
-
Fold case in line comparisons.
Each column will have a number of tab characters prepended to it
equal to the number of lower numbered columns that are being printed.
For example, if column number two is being suppressed, lines printed
in column number one will not have any tabs preceding them, and lines
printed in column number three will have one.
comm
assumes that the files are lexically sorted; all characters
participate in line comparisons.
EXIT STATUS
comm
exits 0 on success, >0 if an error occurred.
SEE ALSO
cmp(1),
diff(1),
sort(1),
uniq(1)
STANDARDS
The
comm
utility conforms to
IEEE Std 1003.2-1992 (``POSIX.2'') .