gnuplot — A graph plotter that outputs in several formats. More information: <https://manned.org/gnuplot>.

Start the interactive graph plotting shell

gnuplot

Plot the graph for the specified graph definition file

gnuplot {{path/to/definition.plt}}

Set the output format by executing a command before loading the definition file

gnuplot -e "{{set output "path/to/file.png" size 1024,768}}" {{path/to/definition.plt}}

Persist the graph plot preview window after gnuplot exits

gnuplot {{[-p|--persist]}} {{path/to/definition.plt}}