select or reject lines common to two files
, which should be sorted lexically, and
produces three text columns as output: lines only in
; lines only in
; and lines in both files.
The filename ``-'' means the standard input.
The following options are available:
- Suppress printing of column 1, lines only in
- Suppress printing of column 2, lines only in
- Suppress printing of column 3, lines common to both.
- Case insensitive comparison of lines.
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.
utility assumes that the files are
lexically sorted; all characters participate in line comparisons.
environment variables affect the
as described in
utility exits 0 on success,
and >0 if an error occurs.
utility conforms to
IEEE Std 1003.2-1992
option is an extension to the POSIX
command appeared in
Version 4 AT&T UNIX