How to exit whole shell script while using the ssh - shell

Question

We are in a situation where we got to check the status of the process over SSH and exit the ssh and script if the process is running and trigger an email if its not running
Below is the snippet of current script which calls status_email function in both the cases.
I am looking for your help to invoke the script only when the process is not running
status_email{
******
****
}
for hostname in `cat ai_hosts.txt`; do
ssh actional#"$hostname" /bin/sh << 'EOF'
pid=`ps -ef | grep <<Process_Details>> | grep -v grep | awk -F ' ' {print'$2'}`
if [ "${pid:-null}" = null ]; then
echo "not running"
else
echo "running"
exit
fi
EOF
status_email;

Answer 1

You can store output of ssh in a variable, then check the variable and depending on its value do something. For example if you save the following code in remote-process-check.sh
#!/bin/sh
host=your-host-name-or-ip-address
status_email () {
echo 'Status email was sent.';
}
output=$(ssh root#"$host" "ps -C $1 >/dev/null && echo 'Running' || echo 'Not running'")
if [ "$output" = 'Not running' ]; then
status_email
fi
You can use it like:
bash remote-process-check.sh process-name
bash remote-process-check.sh mysqld
bash remote-process-check.sh apache2
and if the process is not running status_email function will be invoked and you will see "Status email was sent." in your console.
The interesting part of the script is:
output=$(ssh root#"$host" "ps -C $1 >/dev/null && echo 'Running' || echo 'Not running'")
where with ps -C $1 you are checking if process is running, with >/dev/null you are redirecting the output to the black hole and if command is successful, meaning that the process is running echo 'Running' is executed otherwise echo 'Not running', which is stored in the variable output