TLDR
Enter a command. For example: lzop, matlab, troff, az config.

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 {{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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