Shell Programming and Scripting

 ./test.ksh server1,server2,server3,.........

list=$1
echo ${list} | tr ',' '\n' | while read server;
do
        echo "Server: ${server}"
        echo
        ssh ${server} "hostname"
done

ssh -n ${server} "hostname"

ssh ${server} "hostname" </dev/null

soy@machine: temporal > cat test.sh
#!/bin/ksh
echo $1
echo $@

soy@machine: temporal > ./test.sh host1 host2 host3 host4
host1
host1 host2 host3 host4

for host in ${1//,/ }
do
   echo "running on $host"
   ssh -n $host hostname
done

for hostlist in `cat inputfile`
do
   ssh username@${hostlist} "command to execute"
done