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Wouldn't it just be easier to grab the appropriate package for whichever distro of Linux you are using??

For instance, a good place to start would be the website of whichever distro you are using.

Why such complexity???
ls *.oldext | awk -F"." '{printf "%s.oldext %s.newext\n",$1,$1}' | xargs -n 2 mv -f
I leave it up to the reader to transform that into a shell script using paramters for...