uniq(1) [opendarwin man page]

UNIQ(1) 						    BSD 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 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      Only output lines that are repeated in the input.

     -f num  Ignore the first num fields in each input line when doing comparisons.  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 character is
	     character one.

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

     -i      Case insensitive comparison of lines.

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 is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

HISTORY

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

BSD
								   June 6, 1993 							       BSD

uniq(1) 						      General Commands Manual							   uniq(1)

NAME

       uniq - report repeated lines in a file

SYNOPSIS

       fields] chars] [input_file [output_file]]

DESCRIPTION

       reads  the input text file input_file, comparing adjacent lines, and copies the result to output_file.  If input_file is not specified, the
       standard input and standard output are used.  If input_file is specified, but output_file is not, results are printed to  standard  output.
       input_file and output_file must not be the same file.

   Line-Comparison Options
       recognizes the following options when comparing adjacent lines:

	      Print   those lines that are repeated in the original file.

	      Print   copy only of each repeated line in the input file.

	      Generate an output report in default style
		      except  that  each  line	is  preceded  by a count of the number of times it occurred.  If this option is specified, the and
		      options are ignored if either or both are also present.

       If none of the options or are present, prints the results of the union of the and options, producing a copy of the original input file with
       the  second  and  succeeding  copies of any repeated lines removed.  (Note that repeated lines must be adjacent in order to be found -- see
       sort(1)).

   Field-Skip Options
       Two options are provided for skipping an initial portion of each line when making comparisons:

	      Ignore the first
			     fields fields, together with any blanks before each.  fields is a positive decimal integer.  A field is defined as  a
			     string of non-space, non-tab characters separated by tabs and/or spaces from its neighbors.

	      Ignore the first
			     chars  characters.   chars  is a positive decimal integer.  Each line in the input is assumed to be terminated with a
			     new line character for purposes of comparison.  Fields are skipped before characters.

EXTERNAL INFLUENCES

   Environment Variables
       must be equal to the value it had when the input files were sorted.

       determines the interpretation of text within files as single- and/or multi-byte characters, and defines	a  space  character  when  the	or
       option is used.

       determines the language in which messages are displayed.

       If  or  is  not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty
       variable.  If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization
       variable contains an invalid setting, behaves as if all internationalization variables are set to "C".  See environ(5).

   International Code Set Support
       Single- and multi-byte character code sets are supported.

RETURN VALUE

       Exit values are:

	       0      Successful completion.
	      >0      Error condition occurred.

AUTHOR

       was developed by OSF and HP.

SEE ALSO

       comm(1), sort(1).

STANDARDS CONFORMANCE

																	   uniq(1)