xref: /original-bsd/usr.bin/uniq/uniq.1 (revision b303a108)
Copyright (c) 1985 The Regents of the University of California.
All rights reserved.

%sccs.include.proprietary.roff%

@(#)uniq.1 6.2 (Berkeley) 04/18/91

UNIQ 1 ""
.AT 3
NAME
uniq - report repeated lines in a file
SYNOPSIS
uniq [ -udc [ + n ] [ - n ] ] [ input [ output ] ]
DESCRIPTION
Uniq reads the input file comparing adjacent lines. In the normal case, the second and succeeding copies of repeated lines are removed; the remainder is written on the output file. Note that repeated lines must be adjacent in order to be found; see sort (1). If the -u flag is used, just the lines that are not repeated in the original file are output. The -d option specifies that one copy of just the repeated lines is to be written. The normal mode output is the union of the -u and -d mode outputs.

The -c option supersedes -u and -d and generates an output report in default style but with each line preceded by a count of the number of times it occurred.

The n arguments specify skipping an initial portion of each line in the comparison:

8 - n The first n fields together with any blanks before each are ignored. A field is defined as a string of non-space, non-tab characters separated by tabs and spaces from its neighbors.

8 + n The first n characters are ignored. Fields are skipped before characters.

"SEE ALSO"
sort(1), comm(1)