uniq - remove duplicate lines from a sorted file


SYNOPSIS

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


DESCRIPTION

       Discard  all  but  one  of successive identical lines from
       INPUT (or standard input), writing to OUTPUT (or  standard
       output).

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

       -d, --repeated
              only print duplicate lines

       -D, --all-repeated
              print all duplicate lines

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

       -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

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

       -N     same as -f N

       +N     same as -s N (obsolescent; will be withdrawn)

       --help display this help and exit

       --version
              output version information and exit

       A  field is a run of whitespace, then non-whitespace char­
       acters.  Fields are skipped before chars.


AUTHOR

       Written by Richard Stallman and David MacKenzie.


REPORTING BUGS

       Report bugs to <bug-textutils@gnu.org>.

       Copyright © 2001 Free Software Foundation, Inc.
       This is free software; see the source for  copying  condi­
       tions.  There is NO warranty; not even for MERCHANTABILITY
       or FITNESS FOR A PARTICULAR PURPOSE.


SEE ALSO

       The full documentation for uniq is maintained as a Texinfo
       manual.   If  the  info  and  uniq  programs  are properly
       installed at your site, the command

              info uniq

       should give you access to the complete manual.


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