public static String path2unix(File file)
  {
    return file != null ? path2unix(file.getPath()) : null;
  }
public static String path2unix ( File file ) { return file != null ? path2unix ( file . getPath ( ) ) : null ; }
Convert a file to an Unix like path string. This method just delegates {@link #path2unix(String)}. Returns null if
<code>file</code> parameter is null.

@param file file to convert.
@return Unix like path string.