[BALU] Bash Script ssh to server from list file

Walker Haddock whaddock at mac.com
Thu Apr 7 15:58:16 CDT 2011


See below ...

On Apr 7, 2011, at 3:40 PM, Todd Morgan wrote:

> So I'm finishing up a bash script wrote that will ultimately loop through some code which includes a few ssh commands. The hostnames of the boxes I'm logging into are in a server_list file. For some reason the script will run for the first name in the list but quit after that. Here's what I've tried.
> 
> version 1 - Will only work for the first entry in the $SERVER_LIST file
> 
> while read SERVER
> do
> OTHER_VAR=new-$SERVER (not particularly important to the issue, but I thought I would include it)
> ssh $SERVER exec $some_command1
> ssh $SERVER exec $some_command2
> ssh $SERVER exec $some_command3
> done < $SERVER_LIST
> --------
> Version 2 - same results as #1
> 
> cat $SERVER_LIST | 
> 
> while read SERVER
> do
> OTHER_VAR=new-$SERVER (not particularly important to the issue, but I thought I would include it)
> ssh $SERVER exec $some_command1
> ssh $SERVER exec $some_command2
> ssh $SERVER exec $some_command3
> done
> -------
> version 3 - this one failed miserably
> 
> for SERVER in $SERVER_LIST
s.b
   for SERVER in `cat $SERVER_LIST`
> do
> OTHER_VAR=new-$SERVER (not particularly important to the issue, but I thought I would include it)
> ssh $SERVER exec $some_command1
> ssh $SERVER exec $some_command2
> ssh $SERVER exec $some_command3
> done 
> ------
> 
> Don't know if this is particularly relevant, but the $some_command variables are defined outside of the loop, but modified slightly inside the while statement.
> 
> If I do a VERY basic while loop with echo's I'm fine
> 
> while read SERVER
> do
> echo $SERVER
> $SERVER='diff-name'
> echo $SERVER
> done < $SERVER_LIST
> 
> It iterates through the loop echos out what you'd expect. Any help you can provide would be appreciated. Thanks
> 
> -- 
> Todd Morgan
> Birmingham, AL
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