Launch Demon Start up with Bash Script with MySQL Example

com.startup.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
  <!-- Launch Daemon do not always have access to all the  path variables
       As a results, scripts will sometimes fail if the you are using path variables inside them
       To enable the script to have access to all path variables, open up a terminal and type in -->
  <!-- echo $PATH -->
  <!-- You can opt to filter out some of the path variables which are not required by script-->
    <key>EnvironmentVariables</key>
    <dict>
      <key>PATH</key>
      <string>/usr/local/opt/icu4c/sbin:/usr/local/opt/icu4c/bin:/usr/local/opt/mariadb@10.1/bin/mysql:/usr/local/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/admin/go/bin</string>
    </dict>
    <key>Label</key>
    <!-- By convention, easy launchctl proccesses have unique name as an identifier. To follow naming convention the name of the file should be the same as the identifier name -->
    <string>com.startup</string>
    <key>Program</key>
    <!-- Full Path to the Script File. -->
    <string>/Users/admin/Scripts/startup/startup.sh</string>
    <!-- This key is used to start the job as soon as it has been loaded. For daemons this means execution at boot time, for agents execution at login. -->
    <key>RunAtLoad</key>
    <true/>
    <!-- launchd may be used to make sure that a job is running depending on certain conditions. For this purpose we are setting it to false-->
    <key>KeepAlive</key>
    <false/>
    <!-- Set Launch Only Once to make sure, that it is not repeatedly started-->
    <key>LaunchOnlyOnce</key>        
    <true/>
    <!-- For debugging it is useful to print the output on a tmp file. While tweaking the script file with the script loaded onto the Daemon, it will echo script outputs-->
    <key>StandardOutPath</key>
    <string>/tmp/startup.stdout</string>
    <!-- For debugging it is useful to print the errors on a tmp file. While tweaking the script file with the script loaded onto the Daemon, it will print errors on this file-->
    <key>StandardErrorPath</key>
    <string>/tmp/startup.stderr</string>
    <!-- By default, Launch Daemon Process will run the script as root. But you still have the option to set the username and group to use while executing the script-->
    <key>UserName</key>
    <string>admin</string>
    <key>GroupName</key>
    <string>admin</string>
    <key>InitGroups</key>
    <true/>
  </dict>
</plist>

startup.sh

#!/bin/bash
# Start Mariadb Server if it is not running
if [[ "$(mysql.server status)" =~ "not running" ]]; then
  echo "Start Mariadb"
  mysql.server start
  echo "Started Mariadb"
else
  echo "Mariadb Already Running"
fi