LTspice-cli is a command line tool, which enables running simulations in LTspice from the command line. It also has the ability to specify a file containing the circuit parameters which the simulations should be run with. LTspice-cli is written in Python 2.7, and requires NumPy to run. The tool is only tested with LTspice IV.

After downloading the files, the config.py file must be edited. Once configurated, a simulation can be run using

python run.py -r

To specify a file containing parameters, use

python run.py -f <inputfile>

Use option -h to see help in the command line.

A file can be used to set the parameters in a circuit simulation. A parameter must first be set in LTspice, for example a resistor:

.param R=500

To change a parameter at run time, the set keyword in the parameter file can be used as follows:

set R 1k

The resistor R will now be set to 1k before running the simulation. To set a range of variables to be used in simulation, the run keyword is used. To simulate with the values 1, 100 and 1k for a capacitor C, the following line would be used:

run C 1 100 1k

Both set and run can be used in the same parameter file. Using the set command alone will not run a simulation, only change the LTspice file. To comment a line, begin the line with #.