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     The rename function renames the file or directory specified by
     <oldname> to the name given by <newname>. The old name must be the
     path name of an existing file or directory. The new name must not
     be the name of an existing file or directory.
 
     The rename function can be used to move a file from one directory
     to another by giving a different path name in the <newname>
     argument. However, files cannot be moved from one device to
     another (for example, from drive A to drive B). Directories can
     only be renamed, not moved.
 
     Return Value
 
     The rename function returns 0 if it is successful. On error, it
     returns a nonzero value and sets errno to EACCES, ENOENT, or
     EXDEV.
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