oct(EXPR)

     oct EXPR

             Returns the decimal value of EXPR interpreted as  an
             octal  string.   (If  EXPR happens to start off with
             0x, interprets it as a  hex  string  instead.)   The
             following  will handle decimal, octal and hex in the
             standard notation:

                  $val = oct($val) if $val =~ /^0/;

             If EXPR is omitted, uses $_.