> On which distro do you have problems with chccwdev?
> [snip]
> ..which appears to work fine.

It's not a distribution issue; it's a timing-dependent issue that has to do 
with how quickly your hardware responds. Your script will work *most* of the 
time -- except when it doesn't. 
Easy way to reproduce the problem is to try your script on a zPDT or a heavily 
loaded system where the response to requests may not be immediate. The udev 
settle command isn't a reliable indicator that the device is available. 

I'm looking for a reliable method that works all the time. 

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