Type lpq on command line and see if the Epson printer Queue name is shown,
OR lpstat -d (to know defautl printer) if not, simply “Make Default” the Epson T88iV printer by righ-click on the printer icon and supply lpr command. and it should print to the destination printer. Also make sure the printer is active / not pause state by supplying command as: /usr/bin/enable or /usr/sbin/accept (to accept print job)
Another way u may do that without making the Epson printer default…..
lpr -Pepson xxxx (replace epson with the Epson T88iV Model M129H printer queue name and replace xxxx as ur file name)