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.

• Display each line once:

sort {file} | uniq

• Display only unique lines:

sort {file} | uniq -u

• Display only duplicate lines:

sort {file} | uniq -d

• Display number of occurrences of each line along with that line:

sort {file} | uniq -c

• Display number of occurrences of each line, sorted by the most frequent:

sort {file} | uniq -c | sort -nr

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