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hi,
When i run the code given by you it renames all files irrespective of .bak extension like

before:
student.txt

after code is run
--------------------
student.txt.bak

this is same...

i could not find it

My Question is
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Assume you've a directory (i.e /home/test/) which contains n number of files,
rename all the files which has byte count more than zero (0) with .bak extension. ...