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OpenSolaris 2009.06 - man page for uniq (opensolaris section 1)

uniq(1) 				  User Commands 				  uniq(1)

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

SYNOPSIS
   /usr/bin/uniq
       /usr/bin/uniq [-c | -d | -u] [-f fields] [-s char]
	    [input_file [output_file]]

       /usr/bin/uniq [-c | -d | -u] [-n] [+ m] [input_file [output_file]]

   ksh93
       uniq [-cdiu] [-D[delimit]] [-f fields] [-s chars] [-w chars]
	    [input_file [output_file]]

       uniq [-cdiu] [-D[delimit]] [-n] [+m] [-w chars] [input_file [output_file]]

DESCRIPTION
   /usr/bin/uniq
       The  uniq utility reads an input file comparing adjacent lines and writes one copy of each
       input line on the output. The second and succeeding  copies  of	repeated  adjacent  input
       lines are not written.

       Repeated lines in the input are not detected if they are not adjacent.

   ksh93
       The  uniq  built-in  in	ksh93 is associated with the /bin or /usr/bin path. It is invoked
       when uniq is executed without a pathname prefix and the pathname search finds a	/bin/uniq
       or /usr/bin/uniq executable.

       uniq  reads an input, comparing adjacent lines, and writing one copy of each input line on
       the output. The second and succeeding copies of the repeated adjacent lines are not  writ-
       ten.

       If  output_file	is  not  specified,  uniq writes to standard output. If input_file is not
       specified, or if input_file is -, uniq reads from standard input, and  the  start  of  the
       file is defined as the current offset.

OPTIONS
   /usr/bin/uniq
       The following options are supported by /usr/bin/uniq:

       -c	    Precedes  each  output  line  with	a  count  of the number of times the line
		    occurred in the input.

       -d	    Suppresses the writing of lines that are not repeated in the input.

       -f fields    Ignores the first fields fields on each input line	when  doing  comparisons,
		    where  fields  is  a  positive decimal integer. A field is the maximal string
		    matched by the basic regular expression:

		      [[:blank:]]*[^[:blank:]]*

		    If fields specifies more fields than appear on an input line, a  null  string
		    is used for comparison.

       +m	    Equivalent to -s chars with chars set to m.

       -n	    Equivalent to -f fields with fields set to n.

       -s chars     Ignores  the  first chars characters when doing comparisons, where chars is a
		    positive decimal integer. If specified in conjunction with the -f option, the
		    first  chars  characters  after  the first fields fields is ignored. If chars
		    specifies more characters than remain on an input line, a null string is used
		    for comparison.

       -u	    Suppresses the writing of lines that are repeated in the input.

   ksh93
       The following options are supported by the uniq built-in command is ksh93:

       -c			   Outputs  the number of times each line occurred along with the
       --count			   line.

       -d			   Outputs only duplicate lines.
       --repeated | duplicates

       -D			   Outputs all duplicate lines as a  group  with  an  empty  line
       --all-repeated[=delimit]    delimiter specified by delimit.

				   Specify delimit as one of the following:

				   none        Do not delimit duplicate groups.

				   prepend     Prepend an empty line before each group.

				   separate    Separate each group with an empty line.

				   The	value  for  delimit  can be omitted. The default value is
				   none.

       -f			   Skips over fields number of fields before checking for unique-
       --skip-fields=fields	   ness.   A  field  is  the  minimal  string  matching  the  BRE
				   [[:blank:]]*[^[:blank:]]*.

       -i			   Ignore case in comparisons.
       --ignore-case

       +m			   Equivalent to the -s chars option, with chars set to m.

       -n			   Equivalent to the -f fields option, with fields set to n.

       -s			   Skips over chars number  of	characters  before  checking  for
       --skip-chars=chars	   uniqueness.

				   If  specified  with	the  -f option, the first chars after the
				   first fields are ignored. If the chars specifies more  charac-
				   ters than are on the line, an empty string is used for compar-
				   ison.

       -u			   Outputs unique lines.
       --uniq

       -w			   Skips over any specified fields and characters, then  compares
       --check-chars=chars	   chars number of characters.

OPERANDS
       The following operands are supported:

       input_file     A  path  name  of the input file. If input_file is not specified, or if the
		      input_file is -, the standard input is used.

       output_file    A path name of the output file. If output_file is not specified, the  stan-
		      dard  output is used. The results are unspecified if the file named by out-
		      put_file is the file named by input_file.

EXAMPLES
       Example 1 Using the uniq Command

       The following example lists the contents of the uniq.test file and outputs a copy  of  the
       repeated lines.

	 example% cat uniq.test
	 This is a test.
	 This is a test.
	 TEST.
	 Computer.
	 TEST.
	 TEST.
	 Software.

	 example% uniq -d uniq.test
	 This is a test.
	 TEST.
	 example%

       The next example outputs just those lines that are not repeated in the uniq.test file.

	 example% uniq -u uniq.test
	 TEST.
	 Computer.
	 Software.
	 example%

       The  last  example  outputs  a  report with each line preceded by a count of the number of
       times each line occurred in the file:

	 example% uniq -c uniq.test
	    2 This is a test.
	    1 TEST.
	    1 Computer.
	    2 TEST.
	    1 Software.
	 example%

ENVIRONMENT VARIABLES
       See environ(5) for descriptions of the following environment  variables	that  affect  the
       execution of uniq: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.

EXIT STATUS
       The following exit values are returned:

       0     Successful completion.

       >0    An error occurred.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

   /usr/bin/uniq
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

   ksh93
       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |See below.		   |
       +-----------------------------+-----------------------------+

       The  ksh93  built-in binding to /bin and /usr/bin is Volatile. The built-in interfaces are
       Uncommitted.

SEE ALSO
       comm(1), ksh93(1), , pcat(1), sort(1),  uncompress(1),  attributes(5),  environ(5),  stan-
       dards(5)

SunOS 5.11				   13 Mar 2008					  uniq(1)


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