@User: This comes in several flavors depending on the arguments.

<cellname>

has a namespace and device name. For starters,

magic::gencell sky130::sky130_fd_pr__nfet_01v8

will give you an interactive window to enter parameters. That is probably not what you want. What you want is

magic::gencell sky130::sky130_fd_pr__nfet_01v8 <instance> -spice <param> <value> ...

, for example,

magic::gencell sky130::sky130_fd_pr__nfet_01v8 xm0 -spice W 2.0 L 0.18

. There is a Tcl scripted routine in the magic source code called

toolkit.tcl

and it has a routine in it called

magic::netlist_to_layout

which does more or less what you are attempting to do, except in a trivial way. It reads a SPICE netlist and creates a layout, seeding it with components from the netlist and generating subcircuits and ports. But no attempt to arrange anything; all devices are just placed end-to-end in a row. This procedure can be invoked from the Magic GUI as

File->Import SPICE

(when using the setup files installed by open_pdks).

I am trying that and I can not seem to set many of the parameters (it seems to be mostly the ones that are set though the UI with a checkbox?)

Don't use "-spice" as an argument, then. But then I think you have to do something different with W and L. . . let me check.

Just tried that, it works!

You're welcome!