Why did we get a different result

Perhaps you are running a different Perl version? From perl5280delta:

Previously in-place editing (perl -i) would delete or rename the input file as soon as you started working on a new file. ... This has changed so that the input file isn't replaced until the output file has been completely written and successfully closed. This works by creating a work file in the same directory, which is renamed over the input file once the output file is complete.

In reply to Re^3: How does rename() work on read-only files? by haukex
in thread How does rename() work on read-only files? by j41r

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