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The $? exit status variable will (**should**) work in busybox.
If using the busybox implementation of grep, that might work differently.
If you where running a Linux system (even a LiveCD one) you could get a busybox command shell by:
/bin/busybox ash
I don't have a clue if that will work under Cygwin, I never use Cygwin.
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"Hack is just a four letter word." - - With apologies to B. Dylan - -> JB on BD
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