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uniq(1)

uniq(1)                          User Commands                         uniq(1)



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

SYNOPSIS
       /usr/bin/uniq [ [-c | --count] | [-d | --repeated] | [-u | --unique]
                   | [-D[delimit-method] | --all-repeated[=delimit-method]] ]
            [-f  fields | --skip-fields=fields] [-s chars |--skip-chars=chars]
            [-w | --check-chars=chars] [-i | --ignore-case]
            [-z | --zero-terminated] [input_file [output_file]]


       /usr/bin/uniq [ [-c | --count] | [-d | --repeated] | [-u | --unique]
                   | [-D[delimit-method] | --all-repeated[=delimit-method]] ]
            [-f  fields | --skip-fields=fields] [-s chars |--skip-chars=chars]
            [-w | --check-chars=chars] [-i | --ignore-case]
            [-z | --zero-terminated] [-n] [+m][input_file [output_file]]


       /usr/bin/uniq --help

DESCRIPTION
       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 written.


       If the output file, output_file, is not specified, uniq writes to stan‐
       dard output. If no input_file is given, or if the input_file is -, uniq
       reads  from standard input with the start of the file is defined as the
       current offset.

OPTIONS
       The following options are supported:

       -c, --count

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


       -d, --repeated

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


       -D, --all-repeated[=delimit-method]

           Delimit  groups  of  duplicate  lines  using  one  of the following
           delimit-methods:


           none (default)    No delimiting is done.


           prepend           Prepend each group with a delimiter.


           separate          Separate groups with a delimiter.

           Delimiting is done with a blank line.


       -f, -skip-fields=fields

           Ignores the first fields fields on each input line when doing  com‐
           parisons,  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.


       -i, --ignore-case

           Ignore differences in case when comparing.


       -s, --skip-chars=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 are ignored. If chars specifies more characters  than
           remain on an input line, a null string is used for comparison.


       -u, --unique

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


       -w, --check-chars=chars

           Compare no more than chars characters in a line.


       -z, --zero-terminated

           End lines with 0 byte, not new line.


       -n

           Equivalent to -f  fields with fields set to n.


       +m

           Equivalent to -s  chars with chars set to m.


       --help

           Display command usage and exit.


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 standard output is used. The results  are
                      unspecified if the file named by output_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 out‐
       puts 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(7) 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(7) for descriptions of the following attributes:


       tab()  box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
       TRIBUTE VALUE _ Availabilitysystem/core-os  _  CSIEnabled  _  Interface
       StabilityCommitted _ StandardSee standards(7).


SEE ALSO
       comm(1), sort(1), attributes(7), environ(7), standards(7)



Oracle Solaris 11.4               18 May 2020                          uniq(1)
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