If you set CHECKINT to 0, in the one you posted above, it will update every time you call it.

I don't have a lot of time to debug issues with this right now. My real job is taking up quite a bit of time, and with vacation season upon us, I have some time critical tasks that need to be done before people start to leave on holiday.

This is all pretty basic shell scripting. There are lots of "Learn shell scripting in 20 hours" types of books out there you can get and be working on this on your own in a day or two.