That's a somewhat vague question. I'll assume you are using version 2.1.
To get the last Url added to the html table:
texis -s -d db -l 1 "select Url from html order by id desc"
To get the last Url issued to the gw command:
texis -s -d db -l 1 "select String from options where Name='URL' order by id desc"
See
http://www.thunderstone.com/gw2man/node15.html for a description
of Webinator tables and
http://www.thunderstone.com/texisman/node42.html
for more fun with SQL queries.