uniq <root
UNIQ(1)                                   User Commands                                   UNIQ(1)

NAME
       uniq - report or omit repeated lines

SYNOPSIS
       uniq [OPTION]... [INPUT [OUTPUT]]

DESCRIPTION
       Filter adjacent matching lines from INPUT (or standard input), writing to OUTPUT (or stan‐
       dard output).

       With no options, matching lines are merged to the first occurrence.

       Mandatory arguments to long options are mandatory for short options too.

       -c, --count
              prefix lines by the number of occurrences

       -d, --repeated
              only print duplicate lines, one for each group

       -D     print all duplicate lines

       --all-repeated[=METHOD]
              like    -D,    but    allow    separating    groups    with    an    empty    line;
              METHOD={none(default),prepend,separate}

       -f, --skip-fields=N
              avoid comparing the first N fields

       --group[=METHOD]
              show   all   items,   separating   groups   with   an   empty  line;  METHOD={sepa‐
              rate(default),prepend,append,both}

       -i, --ignore-case
              ignore differences in case when comparing

       -s, --skip-chars=N
              avoid comparing the first N characters

       -u, --unique
              only print unique lines

       -z, --zero-terminated
              line delimiter is NUL, not newline

       -w, --check-chars=N
              compare no more than N characters in lines

       --help display this help and exit

       --version
              output version information and exit

       A field is a run of blanks  (usually  spaces  and/or  TABs),  then  non-blank  characters.
       Fields are skipped before chars.

       Note:  'uniq'  does  not  detect repeated lines unless they are adjacent.  You may want to
       sort the input first, or use 'sort -u' without 'uniq'.  Also, comparisons honor the  rules
       specified by 'LC_COLLATE'.

AUTHOR
       Written by Richard M. Stallman and David MacKenzie.

REPORTING BUGS
       GNU coreutils online help: 
       Report uniq translation bugs to 

COPYRIGHT
       Copyright  ©  2016  Free  Software  Foundation, Inc.  License GPLv3+: GNU GPL version 3 or
       later .
       This is free software: you are free to change and redistribute it.  There is NO  WARRANTY,
       to the extent permitted by law.

SEE ALSO
       comm(1), join(1), sort(1)

       Full documentation at: 
       or available locally via: info '(coreutils) uniq invocation'

GNU coreutils 8.25                        February 2016                                   UNIQ(1)

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