— 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 options are as follows:
- Suppress printing of column 1.
- Suppress printing of column 2.
- Suppress printing of column 3.
- 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.
assumes that the files are lexically sorted;
all characters participate in line comparisons.
utility exits 0 on success,
and >0 if an error occurs.
utility conforms to
IEEE Std 1003.1-2008
The flag [-f
] is an
extension to that specification.
command appeared in
Version 4 AT&T UNIX