To run HSPICE:
"hspice [ *.sp ] > [ *.lis ]"
( e.g. hspice demo1a.sp > demo1a.lis )
To graphically plot results:
"scope" (File -> Open -> Plotfiles and choose HSPICE)
"matlab" (using a manually editted/post-processed "*.lis" file)
"matlab" (OR search the web for reading binary hspice output file)
(try "hspice toolbox for matlab" -- a very useful tool)