OT? need simple scriptable non-interactive plot facility

[Dave Stevens]

I'd like to be able to prepare a chart of about 2k points every hour.
It would need to be scriptable and only really a basic line chart would
be fine. The raw data is available for more sophisticated examination.

Anyone have a candidate app? 

Mint 18.3 and

uname -a
Linux dave-900X1B 4.15.0-74-generic #83~16.04.1-Ubuntu SMP Wed Dec 18
04:56:23 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

TIA

Dave