1. How many files are there in our ~/files directory?
ls ~/files | wc -l
2. How many unique lines are in the song American Pie?
sort americanpie.txt | uniq | wc
3. Can you return a table of repeated lyrics with counts of their frequency, sorted in ascending order of duplication?
sort americanpie.txt | uniq -c | sort -n | grep -v 1