UNIQ(1) | General Commands Manual | UNIQ(1) |
uniq
— report or
filter out repeated lines in a file
uniq |
[-cdu ] [-f
fields] [-s
chars] [input_file
[output_file]] |
The uniq
utility reads the standard input
comparing adjacent lines, and writes a copy of each unique input line to the
standard output. The second and succeeding copies of identical adjacent
input lines are not written. Repeated lines in the input will not be
detected if they are not adjacent, so it may be necessary to sort the files
first.
The following options are available:
-c
-d
-f
fields-s
chars-f
option, the first chars
characters after the first fields fields will be
ignored. Character numbers are one based, i.e., the first character is
character one.-u
Additional arguments input_file and output_file may be specified on the command line, where the former is then used as the name of an input file, and the latter as the name of an output file.
The uniq
utility exits 0 on
success, and >0 if an error occurs.
The historic +
number
and -
number options have been
deprecated but are still supported in this implementation.
The uniq
utility is expected to be
IEEE Std 1003.2 (“POSIX.2”)
compatible.
August 26, 2012 | NetBSD 10.99 |