Just found this little handy feature today:
1 2 3 | mysql> insert into c select rand()*1000, sha1(rand()) from c; Query aborted by Ctrl+C ERROR 1317 (70100): Query execution was interrupted |
So now if you press CTRL-C MySQL Command Line Client will not exit but will terminate query being executed. This is great as so many queries assumed CTRL-C would also abort running query in previous MySQL versions and I’ve seen many monstrous queries left running without noticing [...]

