On Sat, Jul 2, 2022 at 7:02 PM Mark Sutton <
mes@lazo.ca> wrote:
/2 6:05:30 AM PDT, Ori Idan <ori@heliconbooks.com> wrote:
\
o why CTRL/S and CTRL/Q are used for flow control in a shell command
line session
Also would be happy to know.
ASCII reserved four characters, ^Q through ^T, for unspecified device controls. The ASR 33 Teletype, which had a built-in paper tape reader and punch, allowed programmatic control of these devices using these characters: ^Q started the reader (assuming paper tape was in it) and ^S stopped it. In classic Teletype use, the protocol was bidirectional. (By the same token, ^R started the punch, which meant that characters sent to the terminal were punched as well as printed, and ^T stopped it.
Some DEC OSes used ^T to print a single-line status of the current process. I do not know why ^C (end of text, as opposed to ^D which is end of transmission) took on its present role, but it was definitely already true in early DEC OSes.
o why an application memory dump after an application crash is called
a core file