You need to untaint $ENV{PATH} because the user could change it to run his mv instead of the system one. This is particularly relevant in setuid scripts.

In this case, why don't you do 

rename $a{from}, $a{to}
   or die("mov problem.. [$!]");

[download]

In reply to Re: having horrors untainting a path string for moving a file by ikegami
in thread having horrors untainting a path string for moving a file by leocharre

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