Shell Script for automate SSH logins - linux

Question

I have created a shell script for login my servers:
#!/bin/sh
echo "Please hostname ..."
while :
do
read INPUT_STRING
case $INPUT_STRING in
host1)
`bash |sshpass -p 'qwerty123' ssh -o StrictHostKeyChecking=no root#192.168.1.4`
;;
host2)
`sshpass -p 'qwerty123' ssh -o StrictHostKeyChecking=no root#192.168.1.8`
;;
*)
echo "Sorry, I don't understand"
break;
;;
esac
done
echo
echo "Bye"
But I can´t login to the server. I think the issue may be changing the shell on the scrip while accessing the server.
Please help.

Answer 1

The back tics are causing your program to fail. Remove the backticks and also the bash | and you may have a chance. All of the comments I've read are correct, though. You should consider using a public / private key pair. You could make your logins to the hosts easier with ~/.ssh/config.
Try this code for now:
#!/bin/sh
echo "Please hostname ..."
while :
do
read INPUT_STRING
case $INPUT_STRING in
host1)
sshpass -p 'qwerty123' ssh -o StrictHostKeyChecking=no root#192.168.1.4
;;
host2)
sshpass -p 'qwerty123' ssh -o StrictHostKeyChecking=no root#192.168.1.8
;;
*)
echo "Sorry, I don't understand"
break;
;;
esac
done
echo
echo "Bye"
Here's a one liner that pretty much does the same thing:
select INPUT_STRING in host1 host2; do ssh $INPUT_STRING; done
However, you'll need to create a ~/.ssh/config file so that host1 and host2 are mapped to IP addresses:
Host host1
HostName 192.168.1.4
User root
StrictHostKeyChecking no
Host host2
HostName 192.168.1.8
User root
StrictHostKeyChecking no
Also, to avoid the sshpass, you can use commands such as ssh-keygen and ssh-copy-id. Plenty has been written about ssh-keygen and ssh-copy-id so I won't go into it here (the keywords should be enough to get you far).