adding values from a csv column and getting the mean. beginner help

Chris Angelico rosuav at
Wed Dec 11 20:46:57 CET 2013

On Thu, Dec 12, 2013 at 6:41 AM, Mark Lawrence <breamoreboy at> wrote:
>> Square brackets in a usage description often mean "optional". You may
>> want to be careful of that. There's no really good solution though.
> There is, :)

That appears to use <x> for a mandatory argument x, which is then
slightly ambiguous with shell redirection. But that's the best
notation I've ever seen for distinguishing mandatory args from fixed


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