If you need a free and a powerful plotting program Gnuplot would be a good choice for you.
Especially if you are working on a Linux system, you might find many additional utilities making your life easier with Gnuplot.
Without the GUI front ends it will behave more like a command prompt. Also it is capable of reading script type of files and act accordingly.
There are a lot of good Gnuplot tutorials and help pages all over the internet. However, I think this page (not so Frequently Asked Questions) about Gnuplot goes beyond the regular help pages. There are many specific cases, but there are also many generic help.
You can even plot a butterfly with Gnuplot :). (generated using this script from Gnuplot website)
Enjoy your plots...
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