Shell Programming and Scripting

cat mylist.txt
192.123.76.89:lmprod89
162.122.20.28:lmtstserver28
10.80.32.139:hewprod139

for iplist in `cat mylist.txt | cut -d: -f1`
do
  if
  #i will do my logic using vsping in IF condition here
  #it will be something like
  # vsping ip . if exit status = 0 , then pingable
  
  
  
  
  fi

done

while IFS=":" read IP NAME
do
        vsping $IP > /dev/null 2> /dev/null && echo "$IP"
done < mylist.txt > pingable.txt

while IFS=":" read IP NAME
do
        vsping $IP > /dev/null 2> /dev/null && echo "Server : $NAME with IP $IP is pingable" 
done < mylist.txt > pingable.txt

IFS=":"
while  read IP NAME
do
           # MY commands

done < mylist.txt

ksh[6]: vsping:     not found
ksh[3]: grep:     not found
ksh[3]: cut:     not found
ksh[3]: wc:     not found