The following file computes the output characteristics of a MOSFET device over the range 0-10V for VDS and 0-5V for VGS.
MOS output characteristics
.options node nopage
vds 3 0
vgs 2 0
m1 1 2 0 0 mod1 l=4u w=6u ad=10p as=10p
.model mod1 nmos vto=-2 nsub=1.0e15 uo=550
* vids measures Id, we could have used Vds, but Id would be negative
vids 3 1
.dc vds 0 10 .5 vgs 0 5 1
.end