hi friends,
wish you all a very happy new year 2013. :-) a bit late
we have an enterprise application running as cluster on 3-16 nodes in the cluster.
we run few commands simultaneosly few commands using this process.

bash# ssh-agent bash
bash# ssh-add /home/user/.ssh/user_key
bash# command_to_execute_on_multiple_nodes_atonce

the key being common across all the grids, fetching some information from multiple grids in our enterprise using scripts is possible, however entering the key is a manual process only.

If I want to use the "ssh-agent bash" & "/home/user/.ssh/user_key" in a bash script, how do I do?

best regards
mahendra

Not if you're Vietnamese. http://www.vietnamonline.com/tet.html

Entering the key is manual - that's the point of having a passphrase on the key. So you get to choose between:
1. require manual passphrase entry at each use
2. use an ssh key with no passphrase
3. keep the ssh-agent running and use it for a longer period of time


ssh-agent # keep the output in a file perhaps ~/tmp/SSH-AGENT

If that file exists and the PID referenced is a current ssh-agent process as your user
then
source that file
else
start again with a new ssh-agent
ssh-add /home/user/.ssh/user_key
fi

command_to_execute_on_multiple_nodes_atonce # the environment now contains the details of the agent