Shell Programming and Scripting

Hi,

I am writing a script that will require me to perform tasks across servers. I tried to use rsh <host> "Commands..." > /dev/null 2>&1. However, I am required to execute a long series of commands after that and rsh does not seem to support this and its also insecure.

I tried to use rsh to run a local script in the other server but due to the natural of the rsh command, it simply does not work.

Is there any other way for me work this out? Many thanks in advance.

Regards
Joseph

You are right. Running a long list of commands is quite difficult. You are better off using a script. You can use a combination of rcp and rsh to accomplish this.

Code:

rcp /path/to/local_script remote_host:/remote/path
rsh remote_host /remote/path/script

Also, to counter the security issues faced with rsh/remsh/rcp family, you might want to check out ssh. You can find it at www.openssh.org.

Hi,

Thanks for the reply. I have also tried this method but I am still having problems.

rsh <host> "cd /path/; ScriptABC Arg1; touch tempfile" >/dev/null/ 2>&1
And
rsh <host> -n ScriptABC Arg1 >/dev/null/ 2>&1 which is pretty much the same as above.

I tried to run this on the main script. The normal unix commands are done but the ScriptABC is not executed. I tried to run it manually, it works perfectly.

I want to run the rsh command as a background process, open shell do command and then disappear completely.

Regards
Joseph

You cannot run a script that is present on the local system by 'rsh'ing to the remote system. You will have to rcp the script over to the remote system and then rsh and run it.

Hi,

Thanks for the help! Finally manage to resolve this. I also discovered another problem when you perform a rsh from a script into another server, it may not be able to detect your profile, environment settings.

I did this rsh <host> ". <path>/.profile; <path>/script" to resolve this issue. Is there any other way to do the same time?

Regards
Joseph Ng

You can source the profile in the script itself. In the first few lines, you can have '. <path>/.profile'