UNIQ(1)                     General Commands Manual                    UNIQ(1)

NAME
       uniq - Report or omit repeated lines.

SYNOPSIS
       uniq [-D|--all-repeated] [--group] [-w|--check-chars] [-c|--count]
       [-i|--ignore-case] [-d|--repeated] [-s|--skip-chars] [-f|--skip-fields]
       [-u|--unique] [-z|--zero-terminated] [-h|--help] [-V|--version] [files]

DESCRIPTION
       Report or omit repeated lines.

OPTIONS
       -D, --all-repeated[=<delimit-method>]
              print all duplicate lines. Delimiting is done with blank lines.
              [default: none]

              Possible values:

                     o none

                     o prepend

                     o separate

       --group[=<group-method>]
              show all items, separating groups with an empty line. [default:
              separate]

              Possible values:

                     o separate

                     o prepend

                     o append

                     o both

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

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

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

       -d, --repeated
              only print duplicate lines

       -s, --skip-chars <N>
              avoid comparing the first N characters

       -f, --skip-fields <N>
              avoid comparing the first N fields

       -u, --unique
              only print unique lines

       -z, --zero-terminated
              end lines with 0 byte, not newline

       -h, --help
              Print help

       -V, --version
              Print version

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

       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.

VERSION
       v(uutils coreutils) 0.9.0

                                  2026-05-31                           UNIQ(1)