exec = /usr/local/lib/mavis/mavis_tacplus.pl...
that's a glitch in the documentation. Depending on your use case you may try mavis_tacplus_passwd.pl, mavis_tacplus_shadow.pl, mavis_tacplus_ads.pl or any other suitable script from mavis/perl/.I cannot find mavis_tacplus.pl. Should this exist somewhere or can anyone supply the contents of this file or tell me where to look for it?