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UNIQ(1)			FreeBSD	General	Commands Manual		       UNIQ(1)

NAME
     uniq -- report or filter out repeated lines in a file

SYNOPSIS
     uniq [-c |	-d | -u] [-i] [-f num] [-s chars] [input_file [output_file]]

DESCRIPTION
     The uniq utility reads the	specified input_file comparing adjacent	lines,
     and writes	a copy of each unique input line to the	output_file.  If
     input_file	is a single dash (`-') or absent, the standard input is	read.
     If	output_file is absent, standard	output is used for 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 adja-
     cent, so it may be	necessary to sort the files first.

     The following options are available:

     -c	     Precede each output line with the count of	the number of times
	     the line occurred in the input, followed by a single space.

     -d	     Only output lines that are	repeated in the	input.

     -f	num  Ignore the	first num fields in each input line when doing compar-
	     isons.  A field is	a string of non-blank characters separated
	     from adjacent fields by blanks.  Field numbers are	one based,
	     i.e., the first field is field one.

     -s	chars
	     Ignore the	first chars characters in each input line when doing
	     comparisons.  If specified	in conjunction with the	-f option, the
	     first chars characters after the first num	fields will be
	     ignored.  Character numbers are one based,	i.e., the first	char-
	     acter is character	one.

     -u	     Only output lines that are	not repeated in	the input.

     -i	     Case insensitive comparison of lines.

ENVIRONMENT
     The LANG, LC_ALL, LC_COLLATE and LC_CTYPE environment variables affect
     the execution of uniq as described	in environ(7).

DIAGNOSTICS
     The uniq utility exits 0 on success, and >0 if an error occurs.

COMPATIBILITY
     The historic +number and -number options have been	deprecated but are
     still supported in	this implementation.

SEE ALSO
     sort(1)

STANDARDS
     The uniq utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'') as
     amended by	Cor. 1-2002.

HISTORY
     A uniq command appeared in	Version	3 AT&T UNIX.

FreeBSD	10.1			 July 3, 2004			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | ENVIRONMENT | DIAGNOSTICS | COMPATIBILITY | SEE ALSO | STANDARDS | HISTORY

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