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


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

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

       Mandatory arguments to long options are  mandatory  for  short  options

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

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

       -D, --all-repeated[=METHOD]
              print  all duplicate lines groups can be delimited with an empty
              line METHOD={none(default),prepend,separate}

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

              show  all  items,  separating  groups   with   an   empty   line

       -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
              end lines with 0 byte, not newline

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

       --help display this help and exit

              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.

       There is NO WARRANTY, to the extent permitted by law.


       comm(1), join(1), sort(1)

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

              info coreutils 'uniq invocation'

       should give you access to the complete manual.

GNU coreutils 8.22 November 2020 UNIQ(1)

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