is there any GUI tool to see cir files in schematics?

Question

I am using NGspice to simulate circuit. As you may know, the netlist format in ngspice is cir.

The following is my simple circuit.

* Title: Simple attenuator circuit
* Netlist
V1 a 0 100V
R1 a b 10
R2 b 0 10
V2 b x 0V
R3 x 0 10

I have tried to use Qucs (use .sch format) and Kicad, however, neither of them support schematics in CIR format.

Here is what I got from Ltspice when opening in Ltspice.

Answer 1

Use:

This gives:

Then hit s as a key:

After dropping that into the page, you will see:

Now use right-click on your mouse:

And select Run to get:

If you just want the operating point, then select the DC op pnt tab. You will then see:

That's all there is to it.

If you would prefer to see .TRAN (transient) run, then select Transient, instead. However, in this case you will see a blank plot chart. Here, mouse over to the blank plot and right-click to see:

You can choose what to see from there.

LTspice only uses simple ASCII text lines for everything. The schematic is just a means to an end. It's pretty. But it is just a meaningless drawing. The real work ONLY occurs with the ASCII text lines. Not the pretty drawing picture, which is only for you as a human to view. Not for Spice to work with. It doesn't care about the pretty picture. Just the netlist.

Here's the automatically generated netlist from LTspice from a hand-drawn schematic: