Shell Programming and Scripting

application_check()
{
# Linux/UNIX box with ssh key based login
SERVERS=`cat /tmp/server-details`
# SSH User name
USR="user"
# create new file
> /tmp/abc.log
 
# connect each host and pull up user listing
for host in SERVERS
do
echo "--------------------------------" >> /tmp/abc.log
echo "HOST: $host " >> /tmp/abc.log
echo "--------------------------------" >> /tmp/abc.log
 
ssh -q $USR@$host '
       command 1
      command 2
      echo "EOF"
         ' >> /tmp/abc.log
}

 The authenticity of host '10.1.1.1 (10.1.1.1)' can't be established.
RSA key fingerprint is 32:f8:ac:a4:af:ab:dc:3a:02:29:e8:0e:36:2d:06:e4.
Are you sure you want to continue connecting (yes/no)?

 $hosts's password:

if grep "$host" ~/.ssh/known_hosts > /dev/null; then
   ssh -q -o PreferredAuthentications=publickey $USR@$host '
      command 1
      command 2
      echo "EOF"
    ' >> /tmp/abc.log
fi