UNIQ

uniq − remove duplicate lines from a sorted file

uniq [OPTION]... [INPUT [OUTPUT]]

Discard all but one of successive identical lines from INPUT (or standard input), writing to OUTPUT (or standard output).

−c, −−count

prefix lines by the number of occurrences

−d, −−repeated

only print duplicate lines

−D, −−all−repeated

print all duplicate lines

−f, −−skip−fields=N

avoid comparing the first N fields

−i, −−ignore−case

ignore differences in case when comparing

−s, −−skip−chars=N

avoid comparing the first N characters

−u, −−unique

only print unique lines

−w, −−check−chars=N

compare no more than N characters in lines

−N

same as −f N

+N

same as −s N

−−help

display this help and exit

−−version

output version information and exit

A field is a run of whitespace, then non-whitespace characters. Fields are skipped before chars.

Written by Richard Stallman and David MacKenzie.

Report bugs to <bug-textutils@gnu.org>.

Copyright © 1999 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The full documentation for uniq is maintained as a Texinfo manual. If the info and uniq programs are properly installed at your site, the command

info uniq

should give you access to the complete manual.