Electronic – Export vector data from ngspice

PEBACK - I was running my script in batch mode, thinking that stuff in .control would run automatically, pop up a waveform window and exit.

Batch mode does not do this.

Instead, just ngspice circuit.cir.

You have V1 as a DC voltage source. There is no transient switching. You can change it to a PWL or pulse source and then you will get the expected response.