## S3 method for class 'default}(pathname, ...)':
isFileundefined
 - pathname{A
character string of the pathname to be checked.}
   - ...{Not used.}
Returns TRUE if the file specification is a file, otherwise
  FALSE is returned. 
 [object Object]
 To check if it is a directory see isDirectory().
   Internally file.info() is used. 
IO 
programming