A common language is no more practical than a common tool - sometimes you need a hammer and sometimes you need a chainsaw. I've just bought an instrument (Keithly 2 channel source meter 2614B) which uses Lua as it's command and embedded scripting language and that seems to work really well. If I want to write embedded code for a small micro-controller I would use C. Swapping the two over wouldn't work very well at all. I think we're always going to have lots of computer languages.
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