Shell Programming and Scripting

Hello,

I need to run a command on remote Linux using the ssh command from my local machine. I am able to execute the command on remote machine using ssh but it's behaving strangely.

The command is supposed to start a daemon process on remote linux box and the control should return back to me but strangely this does not happen. The command works properly (i.e. starts the daemon process) when I ssh into remote linux box and type the command on console.

Here is how I give command on remote linux machine after sshing into the box.

$ /usr/local/bin/fatality.sh --email=nitins.shukla@gmail.com --log_dir=/tmp/fatality &
[1] 23274
$

This works fine and the process runs as daemon in background.

But when I try to run this command on same Linux box from my local machine, the process does not start as daemon and runs in background. Here's how I give the command from my linux machine

$ ssh root@remotelinux "/usr/local/bin/fatality.sh --email=nitins.shukla@gmail.com --log_dir=/tmp/fatality \"&\""

The control does not return back to me. Logging on the remote linux box I find that the process is running but not as daemon process in background.

Can anyone help how I should pass the command to ssh start the process as daemon process so that the control returns back to me.

Note both the time I am using same user account i.e. root to log on remote linux machine.

Any help is deeply appreciated.

Thank n Regards,
Nitin

Code:

ssh -f root@remotelinux .....

This should not be written like that, more like

Code:

.... &"

ie. the ampersand does not have to be in extra double quotation marks nor must it be escaped with a backslash.

The -f option makes the ssh command on my local linux box to run in background which is not what I intend want to do. I want the process on remote linux (that I am invoking to throught ssh command) to start in background on the remote linux box.

Yep, you got an ssh process on your local machine left, which is not needed anymore, yep. On the remote machine it will run without problems and when sending the command you will be back on your prompt.
I got no better idea atm If I come up with one, I will post it.

I am having the same problem. I am having cruise control kick off a script that deploys to a dev machine nightly and start up the service, yet the ssh process still runs in the background causing cruise control to hang.

I am thinking of trying to run the daemon in a screen so that I can detach from the console, but not sure how to do that in a script, I've only used screen from the command line using the ctrl commands.

Any thoughts?

I found this on google groups: Starting a daemon with ssh - comp.unix.admin | Google Groups

ssh server 'program </dev/null >/dev/null 2>&1 &'

that redirects the stdin to /dev/null, the stdout to /dev/null, and the stderr to stdout

This worked for me so that the remote execution kicked off the daemon and didn't wait around for output.

Will