---
name: "uu-uniq"
section: "1"
platform: "linux"
package: "uutils-coreutils"
version: "0.12.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/uu-uniq"
---

# uu-uniq(1)

Report or omit repeated lines.

## NAME

uniq - Report or omit repeated lines.

## SYNOPSIS

**uniq** \[OPTION\]... \[INPUT \[OUTPUT\]\]

## 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:*

  - •

    none

  - •

    prepend

  - •

    separate

- **--group**\[=*\<group-method\>*\]

  show all items, separating groups with an empty line. \[default: separate\]

  *Possible values:*

  - •

    separate

  - •

    prepend

  - •

    append

  - •

    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) 0.12.0