Or should it be:
if [ $CUR_LENGTH -eq 0 ]; then
instead, to do a numeric comparison? (Either with or without the quotes. It shouldn't matter unless $CUR_LENGTH might be unset.)
I was thinking the same thing.
(OTOH, is that a bashism too? I'd hope not, but I don't know for sure.)
http://www.opengroup.org/onlinepubs/009695399/utilities/test.html suggests it's standardised, so as long as the shell you're using adheres to the SUSV3 standard that construct should work just fine.
Regards,
Matt.
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