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Remote Compilation Using ssh and make

Issue 45

From Issue #45
January 1998

Jan 01, 1998  By John R. Daily
 in
Here's a quick lesson in setting up scripts to use the ssh and make commands for compiling on a remote machine.
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Immediate help in automating a small shell script

Vamsi Krishna.Kunasani's picture
Submitted by Vamsi Krishna.Kunasani (not verified) on Mon, 12/21/2009 - 11:51.

Q) I had done the ssh public/private key generation process and my system get connected to remote system automatically with out password. But I want to get this executed through script and when doing this after getting connected to the remote system,the script is being not working.

for example:
#!/bin/bash
ssh 123.12.3.45 {sample ip}
echo "hai vamsi"

output:
just connecting to remote system and stopping over there.

I need your help in this regards to proceed further ,where I get connect to the remote system and then display the echo string.

Thanks in advance
Vamsi

SSH in script

Mitch Frazier's picture
Submitted by Mitch Frazier on Tue, 12/22/2009 - 09:24.

Once the ssh command connects to the remote system the script is going to "pause" execution until the ssh command exits. This is normal behavior: the shell waits for each command to complete execution before it moves on to the next command.

If you were thinking that the echo command was going to execute on the remote system... it doesn't work that way. If you want to execute the echo remotely then your script needs to be:

#!/bin/bash
ssh 123.12.3.45 echo "hai vamsi"

If you want to execute more than one command remotely then you should place them in a script on the remote system and execute the script with the ssh command.

Mitch Frazier is an Associate Editor for Linux Journal.

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