Linux please make it work on debian Suppose that file1 file

Linux .... please make it work on debian

Suppose that file1, file2, (ile3, file4, and file5x each contain a list of new usernames to be added to the system, but you only have time to add the first 50 users and you need to remove duplicate usernames and save the results to a file named usernames. If you had to type in only one command (using pipes/redirection) of course, what would it be?

Solution

This command can remove the duplicate from the file and save the file without duplicate sort big-csv-file.csv | uniq > duplicates-removed.csv