When you have a file full of duplicates and you want to count them up for any reason, unix like scripts are always there to help! Let’s say we have a file names emails.txt
lewl@gmail.com
boom@gmail.com
lewl@gmail.com
jhon.mcduck@hotmail.com
lewl@gmail.com
Now, applying unix magic
sort emails.txt| uniq -c [~/WebSites/hassek.github.io]
1 boom@gmail.com
1 jhon.mcduck@hotmail.com
3 lewl@gmail.com