someone in the replies elsewhere pointed out that Ctrl+J = 10 in the ASCII table = LF ("line feed") = Enter (because J is the 10th letter of the alphabet)
so Ctrl+J is the same as pressing enter
which I don't have any practical use for but is kind of cool
(edit: some corrections in this reply: https://pgh.social/@ben/112752235264922484)
@[email protected] This isn't quite right in a few ways. LF is decimal 10, ascii 0x0a. It is 10 because it's the 10th letter of the alphabet, though. But it's not the same as pressing enter except in cooked tty modes, where the terminal driver converts the return key (^M, \r, ASCII 13 / 0x0d) to a newline (^J, LF, 10/0xa) which your program then sees as its input.
@Ange @b0rk
And a lot of those "control character quirks" have just become "how things are done" without anyone ever thinking about how it happened.
You can still use Control-D to exit a shell, Control-G sounds a bell and Control-H is either backspace or delete depending on what kind of computer you're using.
Julia Evans
Ange
D C Ross