Re: signal handler output

[hippo]

Is this the shell, the terminal or what?

It's the shell controlling the terminal. Here's what happens in bash if I interrupt both these commands:

$ sleep 30
^C
$ stty -ctlecho; sleep 30

$

As for perl, I expect IO::Stty might be able to do it but I've never used it for that.

[Anonymous Monk]

Not the shell, it's the tty driver itself. For linux, that would be n_tty_receive_char() in drivers/tty/n_tty.c. Upon receiving the control char, it optionally echoes it.