Under Windows, this cannot happen. The rename will fail if the target file exists.
C:\Projects_Perl\testing>rename newfile.txt originalfile.txt
A duplicate file name exists, or the file cannot be found.
It can happen. Use the Windows MOVE command instead of RENAME: 
MOVE /Y newfile.txt originalfile.txt

[download]
Or use Perl: 
perl -e "rename('newfile.txt', 'originalfile.txt')"

[download]

In reply to Re^6: Read in hostfile, modify, output by eyepopslikeamosquito
in thread Read in hostfile, modify, output by razmeth

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