I am new to Linux but need a help with script that will restart the naming service when it's down only if other app services are up and running and do nothing if other service are down. That's in case when there is a app maintenance or Linux servers patching going on. here is what I came up so far:
#!/bin/bash

###edit the following
service=orbadmin ns
email=test@company.com
###stop editing

host=`host -f`
if (( $(ps -ef | grep -v grep | grep $service | wc -l) > 0 ))
then
echo "$service is running"
else
/etc/init.d/$service start
if (( $(ps -ef | grep -v grep | grep $service | wc -l) > 0 ))
then
subject="$service at $host has been started"
echo "$service at $host wasn't running and has been started" | mail -s "$subject" $email
else
subject="$service at $host is not running"
echo "$service at $host is stopped and cannot be started!!!" | mail -s "$subject" $email
fi
fi

This variable declaration won't work as is:
service=orbadmin ns
You'd have to put quotes around it:
service="orbadmin ns"

The next question is are you looking for "orbadmin ns" to be on the same command line in your ps output or are you talking about two different services called "orbadmin" and "ns". If the latter then the rest of your script wouldn't work unless you put in a for loop to check each service e.g.
for svc in $service
do (whatever)
done

Your (whatever) wouldn't be the same for both services though.

You don't have to do the for loop if in fact you're looking for a single "orbadmin ns" line in ps output.

Also I believe you meant to use "hostname -f" rather than "host -f" when setting host variable. You can also use the $() instead of backticks:
host=$(hostanme -f)

1 members found this post helpful.

Thanks MensaWater!