Re: signal handler output

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

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

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Re^2: signal handler output by Anonymous Monk on May 17, 2018 at 14:50 UTC
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.	[reply] [d/l] [select]