looks to me like this would subscribe the whole grassp-list to these
lists....
echo subscribe gnuplot-answers grassp-list@moon.cecer.army.mil | mail listserv@yggdrasil.com
echo subscribe gnuplot-bugs grassp-list@moon.cecer.army.mil | mail listserv@yggdrasil.com
echo subscribe gnuplot-developers grassp-list@moon.cecer.army.mil | mail listserv@yggdrasil.com
echo subscribe gnuplot-questions grassp-list@moon.cecer.army.mil | mail listserv@yggdrasil.com
...maybe not a good idea. (be sure to EDIT appropriately if subscribing)