Persist the graph plot preview window after gnuplot exits

A graph plotter that outputs in several formats.
More information: <http://www.gnuplot.info/>.
Trick copyright: tl;dr; <https://github.com/tldr-pages/tldr>

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

click the source code to copy install gnuplot on any operating system with command-not-found.com