Re: How to send a break?

["H. Peter Anvin" <hpa@zytor.com>]

Followup to:  <01b701c6818d$4bcd37b0$1800a8c0@dcccs>
By author:    =?iso-8859-2?Q?Haar_J=E1nos?= <djani22@netcenter.hu>
In newsgroup: linux.dev.kernel
>
> 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
> 

You can't use it using echo, however, you can do it using Perl:

perl -e 'use POSIX; tcsendbreak(1,0);' > /dev/ttyS0

	-hpa