nag – De­tect­ing and warn­ing about ob­so­lete LaTeX com­mands

Old habits die hard. All the same, there are com­mands, classes and pack­ages which are out­dated and su­per­seded. The nag pack­age pro­vides rou­tines to warn the user about the use of such ob­so­lete things. As an ex­am­ple, we pro­vide an ex­ten­sion that de­tects many of the “sins” de­scribed in l2tabu.