uniq

Linux · Text · available in the simulator

What it does

Removes consecutive duplicate lines (commonly used with sort).

Syntax

uniq [opciones] [entrada [salida]]

Options and parameters

• -c

  Displays the number of occurrences for each line.

  sort log.txt | uniq -c
• -d

  Prints only duplicate lines.

• -u

  Prints only unique lines.

• -i

  Ignores case differences.

Usage examples

• uniq archivo.txt
• sort archivo.txt | uniq -c
• sort datos.txt | uniq
• sort datos.txt | uniq -c
• sort log.txt | uniq -c

Notes and common mistakes

• Only detects consecutive duplicates; typically used after sort.

Related commands

• awk
• cat
• cut
• diff
• grep
• head