Hi
Just wondering whether or not I can remove duplicated lines without sort

For example, I use the command who, which shows users who are logging on. In some cases, it shows duplicated lines of users who are logging on more than one terminal.

Normally, I would do

who | cut -d" " -f1 | sort |uniq

But I realised that I do not want data to be sorted.

Is there any other ways to do it?