Auto run iTunes-Sniper (by Wes Bos) upon system startup in mac OS

cd ~/Library/LaunchAgents

touch com.spotify.daemon.plist

vi com.spotify.daemon.plist

customize & insert following & save and exit vim

<?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>
		<key>Label</key>
		<string>com.spotify.daemon.plist</string>
		
		<key>RunAtLoad</key>
		<true/>
		
		<key>StandardErrorPath</key>
		<string>/Users/raresoft/Documents/spotifyErr.log</string>
		
		<key>StandardOutPath</key>
		<string>/Users/raresoft/Documents/spotify.log</string>
		
		<key>EnvironmentVariables</key>
		<dict>
			<key>PATH</key>
			<string><![CDATA[/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin]]></string>
		</dict>
		<key>WorkingDirectory</key>
		<string>/Users/raresoft/Documents/</string>
		
		<key>ProgramArguments</key>
		<array>
			<string>/usr/local/bin/node</string>
			<string>spotify.js</string>
		</array>
	</dict>
</plist>

<string> under the <key>WorkingDirectory</key> specifies the directory to JS script to be run spotify.js in this case is the script to be run on startup

ENJOY