mass_update.sh

#!/bin/bash                                                                                                                                                                                                                                  
hosts="hio@host1.com hio@host2.com hio@host3.com hio@host4.com hio@host5.com"
cmd="echo 'updating ...';sudo aptitude update >> /dev/null;sudo aptitude safe-upgrade -y;echo 'done'"
 
for i in $hosts
do
    echo "###### connecting to $i ..."
    ssh -t $i $cmd
    echo ""
done