bash with files

[goon12]

I have a file ( tab delimeted ), I want to check for duplicates in the 5th field. I am familiar with cut, to check the 5th field, but I need to loop through the file and make sure that there are no lines with duplicate data in the 5th field. Basically if the 5th field is the same in 3 rows, I only need to keep one of them. How can i do ?

[bwkaz]

Something like <your cut magic here> <sourcefile | sort | uniq maybe? The important part is the | sort | uniq.