sort uniq

By -
sort us -rnk1
reverse sorting for 1 column
Sorted output without duplicates
cat names | sort | uniq
 -------------------


bash-3.00# sort -n s.txt
1.Apple
2.Orange
3.TOmato
4.Potatoes
5.Carrot

bash-3.00# sort -r s.txt
5.Carrot
4.Potatoes
3.TOmato
2.Orange
1.Apple

bash-3.00# cat s.txt
1.Apple
2.Orange
3.TOmato
4.Potatoes
5.Carrot
1.Applie
2.Orange
5.Carrot

bash-3.00# sort s.txt | uniq
1.Apple
1.Applie
2.Orange
3.TOmato
4.Potatoes
5.Carrot

bash-3.00# sort s.txt | uniq -u
1.Apple
1.Applie
3.TOmato
4.Potatoes
----------------
sort file1 | uniq -d
найти 2 одинаковые строки
----------------------
$ 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!

$ sort happybirthday.txt | uniq -u
Happy Birthday Dear Tux!

$ sort happybirthday.txt | uniq -d
Happy Birthday to You!

uniq is to be used always along with the sort command using pipe or using a sorted file as input

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