Wordpress plugin function permissions

I'm building a wordpress plugin, and would like a particular function in the plugin to be able to be called by a a crontab.

Would someone be able to tell me how to do this?

At the minute, for testing purposes I've had to put a link to the function in wordpress backend, if I don't do that, I get a message about not having the required permissions.
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SheppardDigitalAuthor Commented:
Sorry, I should expand...

I know how to create a crontab, the issue is that I'm unable to call my function without being logged into Wordpress.
SheppardDigitalAuthor Commented:
Sorry, this ended up being user error on my part. I figured out where I was going wrong.

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SheppardDigitalAuthor Commented:
User error
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