Changes the name of a file; an existing file NEWNAME will be clobbered. Returns true for success, false otherwise.
Behavior of this function varies wildly depending on your system implementation. For example, it will usually not work across file system boundaries, even though the system mv command sometimes compensates for this. Other restrictions include whether it works on directories, open files, or pre-existing files. Check perlport and either the rename(2) manpage or equivalent system documentation for details.
For a platform independent
move function look at the File::Copy module.
Portability issues: rename in perlport.
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