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    In programming it usually refers to parts of the same executable. But the unix concept of having command line tools that do one thing well which can be combined is pretty similar. Commented Feb 27, 2015 at 19:57
  • so the mainline is the CLI and the functions are what are strung together? Commented Feb 27, 2015 at 19:59
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    Different people may mean different things when using the term. It could be both. I could also argue that a function is a program within a program. Commented Feb 27, 2015 at 20:18