Shell Programming and Scripting

server="icapp1 icapp6 ihapp1 ihapp6 icapp2 icapp3 icapp4 ihapp2 ihapp3 ihapp4 icapp5 ihapp5 "
for i in $server
do
  if [ "$i" == "$input" ]; then
    echo hello
  fi
done

[ "${X}" != "${X/ ${input:-x} /}" ] && echo OK || echo NOK

server="icapp1 icapp6 ihapp1 ihapp6 icapp2 icapp3 icapp4 ihapp2 ihapp3 ihapp4 icapp5 ihapp5 o4 o5 o6 m2 ic_ei ih_ei droltpn1 droltpn2 drmisn2 drmisn2"
printf "\nEnter server: "
read input
if [ $input == $server ]
then
clear
echo "\n"
echo "Hostname: $input"
echo "IP      :`ping $input|head -1|cut -d':' -f2|sed s/\(//|sed s/\)//`"
echo "\n"
sleep 1
else
echo "Wrong input"
sleep 1
Main_chk
fi

if [ $input == "icapp1" ] || [ $input == "icapp6" ] || [ $input == "ihapp1" ] || [ $input == "ihapp6" ] ......................................

flag=0
server="icapp1 icapp6 ihapp1 ihapp6 icapp2 icapp3 icapp4 ihapp2 ihapp3 ihapp4 icapp5 ihapp5 o4 o5 o6 m2 ic_ei ih_ei droltpn1 droltpn2 drmisn2 drmisn2"
printf "\nEnter server: "
read input
for i in $server
do
  if [ "$i" == "$input" ]; then
    flag=1
    break;
  else
    flag=0
  fi
done
 
if [ $flag -eq 1 ]; then
clear
echo "\n"
echo "Hostname: $input"
echo "IP      :`ping $input|head -1|cut -d':' -f2|sed s/\(//|sed s/\)//`"
echo "\n"
sleep 1
else
echo "Wrong input"
sleep 1
Main_chk
fi