[issue9560] platform.py: use -b option for file command in _syscmd_file()

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Is it guaranteed that the -b option will be present in every version of file?

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nosy: +eric.araujo

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<http://bugs.python.org/issue9560>
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