A guess concerning the backspace character: Imagine I send you an email “Hi, here’s the query to update your DB as you wanted” and an attached textfile with
INSERT INTO students VALUES ("Bobby Tables",12,"abc",3.6);
You cat the file, see it’s okay, and just pipe the file to MySQL. What you didn’t know, however, was that I put
DROP TABLE students;\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b
before the INSERT STATEMENT which you didn’t see because on console output the backspaces overwrote it. Bamm!
Just a guess, though.
Edit (couldn’t resist):