Looking for a specific line in the production server's /etc/password with this command: sed -i -n '/foobar/p' /etc/passwd trimmed the file to a single line's

Looking for a specific line in the production server's /etc/password with this command: sed -i -n '/foobar/p' /etc/passwd trimmed the file to a single line's length. D'oh! Shouldn't have added that `-i`, should not have done that. Luckily I could restore it from a (working) backup while still logged in. Phew!