Shell Programming and Scripting

#!/usr/bin/sh
##Take input from the user
c=d=e=0
while [ "$host_name" != done ] 
do
  echo "Please enter the host_name"
  read host_name
  if [ "$host_name" = done ] ; then break; fi
  store_hostname[$c]=$host_name
    #Check if hostname is correct
  validHost=`host $host_name | grep 'not found'`
  if [ "$validHost" != "" ] ; then
  echo "Checking Host" 'Host cannot be resolved. Please check your hostname'
  exit 1
  fi
  c=$(( c + 1 ))
  echo "Please enter the username"
  read username
  store_username[$d]=$username
  d=$(( d + 1 ))
   echo "Please enter the password"
   read -s password
   store_password[$e]=$password
   e=$(( e + 1 ))
done
echo ${store_hostname[0]} 
len=${#store_hostname[*]}
echo $len
for (( i=0; $i < $len; i++ ))
do
host=`echo ${store_hostname[$i]}`
passw=`echo ${store_password[$i]}`
username=`echo ${store_username[$i]}`
ssh -q host@username date
./scplogin.exp $passw $host $username
./sshlogin.exp $passw $host $username
if [ "$?" = 1 ] ; then break; fi
done

#!/bin/sh
ssh -q root@hostname test1.sh

#!/usr/bin/sh
echo "running" >> /path/temp_file
...
do_something
...
#on exit
echo "finish" >> /path/temp_file

#!/bin/sh
answer=$(ssh host "tail -1 /path/temp_file")
[  $answer != "finish" ] && break || echo "Do something else"