uniq man page on 4.4BSD

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UNIQ(1)			  BSD General Commands Manual		       UNIQ(1)

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

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

DESCRIPTION
     The uniq utility reads the standard input comparing adjacent lines, and
     writes a copy of each unique input line to the standard output.  The sec‐
     ond and succeeding copies of identical adjacent input lines are not writ‐
     ten.  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	     Precede each output line with the count of the number of times
	     the line occurred in the input, followed by a single space.

     -d	     Don't output lines that are not repeated in the input.

     -f fields
	     Ignore the first 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 fields fields will be
	     ignored.  Character numbers are one based, i.e. the first charac‐
	     ter is character one.

     -u	     Don't output lines that are repeated in the input.

     If additional arguments are specified on the command line, the first such
     argument is used as the name of an input file, the second is used as the
     name of an output file.

     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 is expected to be IEEE Std 1003.2 (“POSIX.2”) compati‐
     ble.

BSD				 June 6, 1993				   BSD
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