[U-Boot-Users] Conditional 'hush' script examples anyone?

Greetings

I've RTFM'd and I've FAQ'd but I still can't find a single example of the use of conditionals with the u-boot hush shell command line.

I assume its only usable with an autoscript or can environmental variables hold complete conditional blocks. Most interested in this so that I can make sensible decisions about what to do if an image CRC is bad for example (or when to boot a different image after an upgrade).

Examples, examples, examples is what I'm looking for rather than a dry explanation about hush (which I can get close to from any book that documents bash!!)

Many thanks