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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