Shell Script : Service Status Check And start If It's Not Running

Shell Script that check if service is running and if its not then will try to start it. Its good for system admin to make sure the crucial services are running all the time.

Shell Script

#!/bin/bash
if [ "$#" = 0 ]
then
echo "Usage $0 "
exit 1
fi
service=$1
is_running=`ps aux | grep -v grep| grep -v "$0" | grep $service| wc -l | awk '{print $1}'`
if [ $is_running != "0" ] ;
then
echo "Service $service is running"
else
echo
initd=`ls /etc/init.d/ | grep $service | wc -l | awk '{ print $1 }'`
if [ $initd = "1" ];
then
startup=`ls /etc/init.d/ | grep $service`
echo -n "Found startap script /etc/init.d/${startup}. Start it? Y/n ? "
read answer
if [ $answer = "y" -o $answer = "Y" ];
then
echo "Starting service..."
/etc/init.d/${startup} start
fi
fi
fi

Results

[email protected]:/$ ./service.sh apparmor
Service apparmor is not running
Found startap script /etc/init.d/apparmor. Start it? Y/n ? Y
Starting service...
* Starting AppArmor profiles [OK]

Learn Above Script Line By Line

#check if service name passed to script as argument, if there no arguments (0) do next

if [ "$#" = 0 ]

then

"Usage $0 " #write to terminal usage

echo

#since no arguments – we need to exit script and user re-run it

exit 1

#get service name from first argument

service=$1

#this check ,if service running using ps command, after we remove our process from output, since script will also match, with wc we count number of matching lines.

is_running=`ps aux | grep -v grep| grep -v "$0" | grep $service| wc -l | awk '{print $1}'`

#is number of lines are not 0 do next

if [ $is_running != "0" ] ;

then

#just put this line to terminal

echo "Service $service is running"

#if number of precesses is 0

else

#Service $service is not running" #just put this string to terminal

echo

#checking for files in /etc/init.d
(directory with start-up scripts) with name similar to service

initd=`ls /etc/init.d/ | grep $service | wc -l | awk '{ print $1 }'`