send break via SSH and tip.
in [Solaris]
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From: David Kirkby on 11 Jan 2010 00:44 On Jan 10, 2:19 pm, nob...(a)nowhere.invalid (Will Renkel) wrote: > drkir...(a)gmail.com wrote: > > >I've got the following setup. > > > > * Keyboard, mouse and monitor on Sun Ultra 27. The Ultra 27 has no > >serial ports. > > * I SSH from the Ultra 27 to a Blade 2000, which has serial ports on > >it. > > * I use the serial port of the Sun Blade 2000 to set up a Sun Blade > >1000. > > > > > >Ultra 27 $ ssh drkirkby(a)blade 2000 > >blade 2000 $ tip hardwirea > >{OK} boot cdrom. > > > > > >So I've booted the Blade 1000. > > > >If I screw up, and want to send a break to the Blade 1000, how can I > >do it? > > > >Dave > > For me I just ^C and it sends a break with no problem. > > -- > --------------------------------------------------------------- > Will Renkel > Wheaton, Ill. > > --------------------------------------------------------------- Thanks everyone. I'm sure ^C does not work. I eventually got the machine set up (had a problem picking the right terminal type. Sun workstation and command tool, or whatever they are called in Solaris 8 did not work). I think I went for VT100 in the end. The machine is now in my garage (mainly as a heater), so I can't check any of these. Lots of different views on this, which is what happens if you Google the problem. Dave
From: Greg Andrews on 12 Jan 2010 20:15 David Kirkby <drkirkby(a)gmail.com> writes: > >Ultra 27 $ ssh drkirkby(a)blade 2000 >blade 2000 $ tip hardwirea >{OK} boot cdrom. > > >So I've booted the Blade 1000. > >If I screw up, and want to send a break to the Blade 1000, how can I >do it? > As has been explained, the tip program on the blade tells the RS232 driver to generate the break signal. In order to command tip to do this, you must send it a tilde (~) followed by a pound (#). However, your ssh command defaults to also using tilde as a command character, so it will swallow the tilde and not send it along to tip. The easiest way to make ssh send a tilde is to press two of them (~~). Ssh will swallow the first and send the second. This results in two tildes and pound as the sequence of keystrokes: ~~# However, what hasn't been pointed out yet is that tip doesn't always interpret a tilde as the start of a command. If you type the ~~# at a point where tip isn't listening for a command, then it will appear to ignore you. This causes a lot of people to post angry rants about how unreliable tip is and how frustrating it is to make it send a break. Tip listens for command sequences when it thinks you're at the start of a new command. I.e., after you've pressed Enter. If you've typed a few other things and then try to tell it to send a break, tip thinks you're in the middle of a command and not the start, so it ignores the ~# you type. (ssh does this too) So the way to reliably make tip send a break signal is to press Enter once or twice, then tilde, then pound. Since you're going through ssh, you add the extra tilde. So I'll write it out as words: Enter Enter tilde tilde pound aka: ~~# Enjoy! -Greg -- Do NOT reply via e-mail. Reply in the newsgroup.
From: Greg Andrews on 12 Jan 2010 20:20 nobody(a)nowhere.invalid (Will Renkel) writes: > >For me I just ^C and it sends a break with no problem. > Lots of people erroneously call that an RS232 "break" signal. It isn't. It's a software interrupt signal. -Greg -- Do NOT reply via e-mail. Reply in the newsgroup.
From: David Kirkby on 14 Jan 2010 00:38 On Jan 13, 1:15 am, g...(a)panix.com (Greg Andrews) wrote: > David Kirkby <drkir...(a)gmail.com> writes: > > >Ultra 27 $ ssh drkirkby(a)blade 2000 > >blade 2000 $ tip hardwirea > >{OK} boot cdrom. > > >So I've booted the Blade 1000. > > >If I screw up, and want to send a break to the Blade 1000, how can I > >do it? > > As has been explained, the tip program on the blade tells the > RS232 driver to generate the break signal. In order to command > tip to do this, you must send it a tilde (~) followed by a pound > (#). However, your ssh command defaults to also using tilde as > a command character, so it will swallow the tilde and not send > it along to tip. The easiest way to make ssh send a tilde is > to press two of them (~~). Ssh will swallow the first and send > the second. This results in two tildes and pound as the sequence > of keystrokes: ~~# > > However, what hasn't been pointed out yet is that tip doesn't > always interpret a tilde as the start of a command. If you type > the ~~# at a point where tip isn't listening for a command, then > it will appear to ignore you. This causes a lot of people to post > angry rants about how unreliable tip is and how frustrating it is > to make it send a break. > > Tip listens for command sequences when it thinks you're at the > start of a new command. I.e., after you've pressed Enter. > If you've typed a few other things and then try to tell it to > send a break, tip thinks you're in the middle of a command and > not the start, so it ignores the ~# you type. (ssh does this too) > > So the way to reliably make tip send a break signal is to press > Enter once or twice, then tilde, then pound. Since you're going > through ssh, you add the extra tilde. So I'll write it out as > words: > > Enter Enter tilde tilde pound > > aka: > > ~~# > > Enjoy! > > -Greg > -- > Do NOT reply via e-mail. > Reply in the newsgroup. I might well have been up a creek without a paddle in this case. I was using the interactive installer, but since the terminal type was not correct, the screen was a mess. So it would have been impossible to get to a command line. The installer would have swallowed up any presses of enter. I think it accepts ESC-2, ESC-4 and perhaps ESC-5 depending on what menu you are in. But of course, when the terminal type is all wrong, and all you can see is a mess, its next to impossible to do anything. Hence my desire to send a break. I think if all else had failed, I would have connected a laptop and used Putty. I forget how to do it, but I have managed to send breaks from that before.
From: hume.spamfilter on 14 Jan 2010 18:40 David Kirkby <drkirkby(a)gmail.com> wrote: > get to a command line. The installer would have swallowed up any > presses of enter. I think it accepts ESC-2, ESC-4 and perhaps ESC-5 That doesn't matter; tip sees the return go by and "perks up" looking for a tilde. If one doesn't come it just drives on. -- Brandon Hume - hume -> BOFH.Ca, http://WWW.BOFH.Ca/
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