How can I execute sudo commands as a cron job? I'm trying to execute a shell script as a cron job. The problem is that my script needs to be run as a super user. I tried it with just writing sudo infront of the command in my crontab file, but it didn't work.
Cron is not in any way deprecated, but LaunchD has more versatility and is used, and actively maintained/supported by Apple.  Their best practices guide is here

LaunchDaemon jobs(versus LaunchAgents, which take on a users id) run in root's context without needing to enable the root user. All that is required is a properly formed XML file(you can just copy-paste pre-existing ones in /Library/LaunchDaemons, substituting your script for the ProgramArguments with the applicable schedule keys) with the proper ownership/permissions.  An older writeup can be found here:
afp548's launchd-in-depth article