By default your Mac checks for Updates once a week. For me personally I want it to check more often. So here is what I did:
1. open Terminal
2. enter this command: defaults write com.apple.SoftwareUpdate ScheduleFrequency -int 1
3. Hit Enter & you're done!
This command will make your Mac check for Software update once per 1 day. So 1 is the number of days.
You can of course change the number at the end after "-int". It will then check once every "number of days you want".
