Comments on: Send Remote Commands Via SSH

By: SSH Executing Remote Commands | bryanstamour.com

SSH Executing Remote Commands | bryanstamour.com — Sun, 27 Jun 2010 17:15:08 +0000

[...] you can pass the -t flag to ssh. I didn’t know this before, I found out today while reading systemsboy’s [...]

By: davessh -p 8222 smtp1.sound-i.co.uk 'screen -rd'

davessh -p 8222 smtp1.sound-i.co.uk 'screen -rd' — Mon, 24 May 2010 17:26:35 +0000

silky, i use the -t to reattach my screen session once ssh has connected (using keyless logins). Moist, now i can run one command, connect to my chat server and reattach my screen so my irc stays connected permantly. Nice!!

By: Jussi

Jussi — Mon, 03 May 2010 07:55:36 +0000

@systemsboy and @Razi:
One scenario where you would like to have behaviour like described is when you would like to attach to a remote screen automatically (with for example “screen -dr”) but would also like to later detach the screen to be able to do something else on the server.

If the run command is only “screen -dr” the detaching from the screen session would also log you out. Ouch. I personally use “screen -dr && bash -i” as the command to run. It’s not the most beautiful approach but seems to work.

Why do I want it? I run screen+irssi on a remote server. Whenever my internet connection breaks for long enough time for the ssh session to break, I want to be able to reconnect and be ready for IRC business as soon as possible with as little hassle as possible

By: Tim

Tim — Wed, 30 Jul 2008 22:00:00 +0000

With openssh you can set a ConnectTimeout…
ssh -o ConnectTimeout=8 blah blah

Timeout is in seconds.

By: systemsboy

systemsboy — Tue, 01 Jul 2008 23:53:00 +0000

Razi,

The end of the command should not log you out of the Terminal. It should only log you out of the machine you're SSHing to. If you don't want to log out of that machine, there's not really any reason to use this method. Just SSH into the machine and run your command(s). Then log out when you're good and ready.

Or, to answer your question more directly, I don't know of a way to do this, but I don't really know why you'd need to either.

-systemsboy

By: Razi

Razi — Fri, 27 Jun 2008 05:22:00 +0000

How do I accomplish the same task but after I terminate the command, I want to remain logged into the terminal?

By: systemsboy

systemsboy — Wed, 23 Jan 2008 20:51:00 +0000

Yup. Nothing like a good ol' for loop. You could do similar with a simple list of computer names:
for computer in `cat computers.txt`; do ssh -t user@$computer.domain 'ls /Applications'; done

Love it!

-systemsboy

By: kernalpanx

kernalpanx — Wed, 23 Jan 2008 20:42:00 +0000

when u have more then one server to do that too…… with a good naming convention you can laways use the for command
for i in 1 2 3 4 5 6 7 8 9 10 11 ; do ssh admin@fileserver$i.domain.com ‘date’ ‘cd / ; du -sh /* ; done

etc etc

By: linux_newbie8478

linux_newbie8478 — Thu, 06 Dec 2007 01:29:00 +0000

Hi,

I'm writing a small python script, which should ssh to 5 diff boxes and get the result for uptime from each box. I want to run this as a daemon process so that I know the least loaded box at any time.

This can be easily done using a simple for loop around -
load = str(commands.getoutput("ssh " + machine[0]+ " uptime"))

But the problem arises when 1 of the 5 remote machines is down. The script just waits for a response from that machine and does not move on to the next box

How do I instruct the ssh cmd to timeout after say 1 min?

This can be achieved using a Timer thread in the python script, but it would be much easier if ssh had a switch for the same.

Unfortunately I can't locate anything in the man pages for ssh

BTW I'm using -
$ ssh -V
OpenSSH_3.6.1p2, SSH protocols 1.5/2.0, OpenSSL 0x0090701f
$

Thanks for your help

By: systemsboy

systemsboy — Tue, 14 Nov 2006 18:08:00 +0000

Ashley,

Excellent! Thank you!

-systemboy