09-25-2012
What I often do is make the GNUplot script itself a BASH script, which I execute and feed the output into gnuplot's stdin, or a temporary file. Things which need to vary can be fed in via commandline parameters. A bit more flexible, and a lot more direct, than dozens of little fiddly sed things.
This'd be tricky even in awk, because of the way it needs to put back changes it made earlier... It would have no way of knowing when the end of file is coming, after all. The script that generates it in the first place might.
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