Ubuntu/Linux shell script to run using cron to confirm services status, if not running then send email and start the service

start.sh

#!/bin/sh

APACHE2_STATUS="$(systemctl is-active apache2.service)"
MYSQL_STATUS="$(systemctl is-active mysql.service)"
NGINX_STATUS="$(systemctl is-active nginx.service)"
DOVECOT_STATUS="$(systemctl is-active dovecot.service)"
START_SCRIPT_DEBUG="true"
FLAG_STATUS="active"

SendEmail(){  
    if [ $1 = "active" ]
    then
        echo "$2 is running" | mail -s "$2 Status" kuldipem@gmail.com
    else
        echo "$2 is not running" | mail -s "$2 Status" kuldipem@gmail.com
    fi 
} 

if [ $APACHE2_STATUS = $FLAG_STATUS ]
then
 echo "Apache2 is running"
else
 SendEmail $APACHE2_STATUS "Apache2"
 /etc/init.d/apache2 start > /dev/null
fi

if [ $MYSQL_STATUS = $FLAG_STATUS ]
then
 echo "mysql is running"
else
 SendEmail $MYSQL_STATUS "mysql"
 /etc/init.d/mysql start > /dev/null
fi

if [ $NGINX_STATUS = $FLAG_STATUS ]
then
 echo "nginx is running"
else
 SendEmail $NGINX_STATUS "nginx"
 /etc/init.d/nginx start > /dev/null
fi

if [ $DOVECOT_STATUS = $FLAG_STATUS ]
then
 echo "dovecot is running"
else
 SendEmail $DOVECOT_STATUS "dovecot"
 /etc/init.d/dovecot start > /dev/null
fi