du.exe v3.5/4.1 or v3.16/4.0: where is the bug?

[Elisabetta Flamini]

Hello.
My problem is about different versions of du.exe that work in a different
way.

Details:
the argument is executing du against a file owned by a different user than
the one running du.

first case:
du <file>
<disk usage>       <file>

du --version
GNU fileutils 3.5
GNU fileutils 4.1



second case:
du <file>
<file>: Permission denied

du --version
GNU fileutils 3.16
GNU fileutils 4.0

In other words, using version 3.16 or 4.0 du fails to execute due to
restricted permissions on the file.
What I wonder is why the behaviour changed through all those du.exe
versions and finally what should be the right way of working.

Many thanks,
Elisabetta




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