Re: How to send a break?

[Valdis.Kletnieks@vt.edu]

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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