private function optShortName($o) {
		$o = $this->opt($o);
		return is_numeric($this->spec[$o][0]) ? null : $this->spec[$o][0];
	}
private function optShortName($o) {
		$o = $this->opt($o);
		return is_numeric($this->spec[$o][0]) ? null : $this->spec[$o][0];
	}
private function optShortName ( $ o ) { $ o = $ this -> opt ( $ o ) ; return is_numeric ( $ this -> spec [ $ o ] [ 0 ] ) ? null : $ this -> spec [ $ o ] [ 0 ] ; }
Retreive the short name of an option
@param string $o
@return string
Retreive the short name of an option