SSH to remote hosts in shell scripting


 
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# 1  
Old 03-29-2014
Linux SSH to remote hosts in shell scripting

Hi There,

I have a file contaning some 100 servers names one by one the file called redhat_servers.txt

I want to prepare a script where it should give me the host name and kernal version.

I wrote like this,

Code:
#!/bin/bash
while read line
do
        ssh $line "uname -nr"
done < redhat_servers.txt

but here the problem is, it is ssh to the first line, i mean first server in the redhat_servers.txt file and then script is not moving forward.

I am in /bin/tcsh shell.

Kindly suggest me in the above.

Last edited by bartus11; 03-29-2014 at 07:15 AM.. Reason: Please use [code][/code] tags.
# 2  
Old 03-29-2014
Hi, try using ssh -n
# 3  
Old 03-31-2014
This how I run a check like the one you want.

Code:
for s in `cat redhat_servers.txt`
do ssh -q $s uname -rn
done

I hope this helps
# 4  
Old 03-31-2014
Quote:
Originally Posted by kumar85shiv
but here the problem is, it is ssh to the first line, i mean first server in the redhat_servers.txt file and then script is not moving forward.
The problem is, ssh tries to read from standard input to get more commands.

What is standard input, inside that loop? "redhat_servers.txt". So the ssh command 'eats' all the lines.

ssh -n, or ssh < /dev/null, fixes this as others have noted.

Good luck Smilie
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