uniq

Remove consecutive duplicate lines

uniq removes adjacent duplicate lines. It only works on sorted input. Always pipe sort before uniq. uniq -c prefixes each line with a count.

Example

$ echo -e 'apple\napple\nbanana' | sort | uniq -c | sort -rn
      2 apple
      1 banana

Tip: Type it yourself in the terminal below - reading is not the same as doing.