Shell Programming and Scripting

 
grep -E '^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' Myfile | awk '{for(i=2;i<=NF;i++)print $1,$i}' > temp
printf "Host/AliasName\t\t\t\t\t\tIPAddress\t\t\tResolved\tReplied\n" >log.txt
while read ip host
do
ip1=$(ping -q -c 1 -t 1 "$host" |grep PING | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}')
ping_stat=`ping -c 4 useipapd01 | grep loss | awk '{print $6}'`
if [[ "$ip1" = "$ip" && "$ping_stat" = "0%" ]]
then
echo "$host $ip Y Y" | awk '{printf "%-50s\t%-15s\t%8s\t%8s\n",$1,$2,$3,$4}' >>log.txt
else
echo "$host $ip N N"| awk '{printf "%-50s\t%-15s\t%8s\t%8s\n",$1,$2,$3,$4}' >>log.txt
fi

 
 ssh hostname@useipapd03 'bash -s' < TestPing.sh

for host in $(< host.list)
do
     echo "\n=== $host ===\n"
     ssh -n root@$host "cd /dir; pwd; ls -lrt"
done > /dir/log

for host in $(< host.list)
do
    ssh -n root@$host "hostname; some_command > /dir/log;"
    scp -p root@$host:/dir/log /localdir/log.$host
done