Aside, sed -n /re/p is grep. sed's default is to print every line at the end of the script, -n says not to. Larry Wall rightly had perl(1) inherit -n alon

Aside, sed -n /re/p is grep. sed's default is to print every line at the end of the script, -n says not to. Larry Wall rightly had perl(1) inherit -n along with perl's -p.