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Shell Programming and Scripting

ssh execution help needed.

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# 1  
Old 03-23-2010
ssh execution help needed.
I m writing a program to execute remote script .
(display remote file content)
Whenever i execute following statement it gives me an error.


Code:
$command="cat /root/vm.cfg"
ssh -ttq root@10.180.8.236 $command


However following script work find.
Code:
ssh -ttq root@10.180.8.236 cat /root/vm.cfg

I have added rsa key so that it should not ask for any password while doing ssh.


What is wrong with using variable in ssh.
What could be the issue here?
Last edited by zaxxon; 03-23-2010 at 08:35 AM.. Reason: code tags - this is no php so just use [code] tags.
# 2  
Old 03-23-2010
Please post the error output.

Your example should work. From your explaination it is not clear to me if you only have problem with variable substitution or something with your password/key since you do mention that too.
To use ssh without password prompt you'll have to create and exchange keys that have been generated without entering a password while doing so (as side note).
# 3  
Old 03-23-2010
Thanks for your reply .
As i mentioned
this query work fine from command prompt
Code:
ssh -ttq root@10.180.8.236 cat /root/vm.cfg

Last edited by zaxxon; 03-23-2010 at 08:44 AM.. Reason: coooooooode tags, ty
# 4  
Old 03-23-2010
Hi,

use double quotes for the command variable

ssh -ttq root@10.180.8.236 "$command"
# 5  
Old 03-23-2010
Yes, I have read this.

Your answer does not help much:
Code:
$> VAR="ls -la /etc/hosts"
$> ssh somehost "${VAR}"
-rw-r--r-- 1 root root 1128 2010-03-01 13:45 /etc/hosts

But now I see your typo:
Code:
$command="cat /root/vm.cfg"

Leave the $ out.
# 6  
Old 03-23-2010
It got executed .But My problem is i m not able to execute the same from script.
I think it has something to do with scope of the variable.
# 7  
Old 03-23-2010
As script there is no difference. I asked 2 times already - here is the third and last time: Post your error output you get, thank you.
Guessing around and asking the same stuff all the time is getting tideous Smilie

Code:
$> cat mach.ksh
#!/usr/bin/ksh

VAR="ls -la /etc/hosts"
ssh somehost "${VAR}"
$> ./mach.ksh
-rw-r--r-- 1 root root 1128 2010-03-01 13:45 /etc/hosts
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