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I've bash scripts that echo the load of my machine.
I'd like to know if there is a simple way to plot the data, like using Tcl.
I also though about rewriting them in python, but don't know which module to use for plotting.
I actually like how gkrellm looks, the best would be to redirect the data and make similar plotting.
Any hints here?
The style of plotting tool you want is commonly called a strip chart. A google search involving those terms seems to turn up several results. I frequently use gnuplot, driven by a perl script to iteratively update its plotting window, to accomplish what you seem to want.
Further to what theNbomr says (excellent reference there for gnuplot), and others; I feel you are absolutely not going to be able to plot in a script, you would have to employ something with better performance and more incorporated into the XServer. Either gnuplot or the Qwt extension of Qt is going to get you much better results.