uniq

Output the unique lines from the given input or file. Since it does not detect repeated lines unless they are adjacent, we need to sort them first. More information: https://www.gnu.org/software/coreutils/uniq.

• Display each line once:
  sort {{path/to/file}} | uniq
• Display only unique lines:
  sort {{path/to/file}} | uniq -u
• Display only duplicate lines:
  sort {{path/to/file}} | uniq -d
• Display number of occurrences of each line along with that line:
  sort {{path/to/file}} | uniq -c
• Display number of occurrences of each line, sorted by the most frequent:
  sort {{path/to/file}} | uniq -c | sort -nr