Loop Script?

Shell Programming and Scripting
1

Hello World
I need to create a script to verify ports are open from a new jump off node to access over 200 different servers.

I did a little research and put together this code:

!/bin/sh
exec 4<nodes.dat
while read sys <& 4
do
# PING TEST
echo "$sys"
ping $sys 1
# Example of executing a remote command on the node in this script
#ssh $sys "uname -n"
done

In the past I've used something like this as well:

123456789@cmp-lights:
/home/123456789/proxy/conf$ nc -z -w 10 thomas 22
Connection to thomas 22 port [tcp/ssh] succeeded!
123456789@cmp-lights:
/home/123456789/proxy/conf$ nc -z -w 10 cmp-lightsking 22
123456789@cmp-lights:
/home/123456789/proxy/conf$

Not sure how to include the list of servers and not sure if this code will work, but any help would be appreciated.

2

first line looks like a typo, should have been

#!/bin/sh