On 2018-10-31, Tinker <t1...@protonmail.ch> wrote: > Hi, > > When in "cat" or "dd if=/dev/zero of=/dev/zero" or "gzip < /dev/zero > > /dev/zero", if I press ctrl+4, the program coredumps. > > Doing it in ksh or sh has no effect though. > > This is in OpenBSD 6.4 AMD64 from Putty on Windows. > > The console interaction looks like this: > > $ cat > ^\Quit (core dumped) > > $ > > > Is ctrl+4 a universal SIGQUIT+coredump shortcut? > > Where are the other shortcuts apart from ctrl+C, ctrl+Z, ctrl+D, > documented? > > Tinker > >
No idea how ^4 is mapped to ^\, but for some reason it is, and this the default for "quit", see "stty -a". This is a useful sequence to interrupt boot if you weren't quick enough to "boot -s" to enter single-user mode.