Shell Programming and Scripting

172.34.45.67      Host1 Host2
134.45.56.67      Host3 Host4 Host5

172.34.45.67      Host1
172.34.45.67      Host2
134.45.56.67      Host3 
134.45.56.67      Host4
134.45.56.67      Host5

awk '{for(i=2;i<=NF;i++)print $1,$i}' file

awk '{for(i=2;i<=NF;i++)print $1,$i}' $file

awk '{for(i=2;i<=NF;i++)print $1,$i}' $file > temp
mv temp $file

172.34.45.67      Host1
172.34.45.67      Host2
134.45.56.67      Host3 
134.45.56.67      Host4
134.45.56.67      Host5

counter=0
typeset -a Server
while IFS=" " read name ip; do
Server[counter].name=$name
Server[counter].ip=$ip

while read ip host
do
        # ping $ip
        # ping $host
done < file

typeset -a HOST
typeset -a IP
typeset -i idx

while read ip host
do
        (( idx++ ))
        HOST[$idx]="$host"
        IP[$idx]="$ip"
done < file

 
"[: -lt: unary operator expected"

 
while read ip host
do
(( idx++ ))
HOST[$idx]="$host"
IP[$idx]="$ip"
if [ $(ping -q -c 1 -t 1 "$host" |grep PING | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}') = "$ip" ]

 
if [ $(ping -q -c 1 -t 1 "$host" |grep PING | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}') = "$ip" ]