How do I write this?

* list all files bigger than 1 mb, in the catalgo your in in a sorted list

* Count number of uniq rows in a file xxxx.txt

* List all logged in users in a sorted list. No user may be listet more than once.

Who is Participating?
1. find /directory -size +1M | sort

2. sort xxxx.txt | uniq | wc -l

3. who | cut -d" " -f1 | sort | uniq
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