On Mon, 29 May 2006 11:08:15 EDT, "linux-os (Dick Johnson)" said: > > On Sat, 27 May 2006, [iso-8859-2] Haar János wrote: > > > Hello, list, > > > > I wish to know, how to send a "BREAK" to trigger the sysreq functions on the > > serial line, using echo. > > > > I mean like this: > > > > #!/bin/bash > > echo "?BREAK?" >/dev/ttyS0 > > sleep 2 > > echo "m" >/dev/ttyS0 > > > > Thanks, > > Janos > > > > Can't you use /proc/sysrq-trigger? That can be tricky if the other end of /dev/ttyS0 is plugged into a debugging serial port on an embedded system where you don't have easy access to a shell. Or for that matter, if you're trying to talk to the serial port on a non-embedded system, which is too far into OOM thrashing for you to be able to get a usable shell prompt.....
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