1 2 3 4 5 6 7 8 9 10 11 12 13 | $ cat happybirthday.txt Happy Birthday to You! Happy Birthday to You! Happy Birthday Dear Tux! Happy Birthday to You! $ sort happybirthday.txt Happy Birthday Dear Tux! Happy Birthday to You! Happy Birthday to You! Happy Birthday to You! $ sort happybirthday.txt | uniq Happy Birthday Dear Tux! Happy Birthday to You! |
1 2 3 4 | $ sort happybirthday.txt | uniq -u Happy Birthday Dear Tux! $ sort happybirthday.txt | uniq -d Happy Birthday to You! |
1 2 3 4 | $ sort happybirthday.txt | uniq -uc 1 Happy Birthday Dear Tux! $ sort happybirthday.txt | uniq -dc 3 Happy Birthday to You! |
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