Question

If you have a file named phone-numbers.txt that looks like this:

207-568-6723
617-277-2343
207-822-9645
603-314-5892
800-233-3413

Doing "sort phone-numbers.txt" will end up sorting by area code.

What if you want to sort by the last 4 numbers?

		sort -n phone-numbers.txt
		sort -t\- -k3 phone-numbers.txt
		sort [[:allnum:]]$ phone-numbers.txt
		cat -r phone-numbers.txt | sort -rn

Answer 1

sort -t\- -k3 phone-numbers.txt