[colug-432] Portable Shell

[Eric Floehr]

>
> One of the biggest shell script portability issues I've run into - going
> between Linux and OS X (BSD variant) - is not with bash itself, but with
> tools like sed being slightly different.  The solution on OSX is to use the
> gnu tools (i.e. gsed) from homebrew - but it's confusing until you know
> that's what's happening.
>

I would concur, it's a bigger issue than shell command compatibility. sed
especially on OSX is ancient. For example, in-place editing is different
between GNU and OSX versions.

-Eric
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