令 has two minor extra readings beyond the everyday 4th-tone command sense. As
令 (3rd tone) it is a classifier for a ream of 500 sheets of paper (industry term, almost never spoken). As
令 (2nd tone) it appears bound in
脊令 (the wagtail bird, classical) and the two-character surname
令狐 (Taiwan reads this lìnghú). Default to lìng unless these specific contexts apply.