On Fri, 19 Apr 2002, at 1:36pm, [EMAIL PROTECTED] wrote:
> What's with the 'let' keyword? I've seen it before, but I find it's use
> so rare that I just realized I don't really understand it's proper use?
It forces airthmatic evaluation, similar to $((...)) and the 'eval'
command. These all print the same thing:
expr 5 + 5
echo $(( 5 + 5 ))
let foo='5 + 5'
echo $foo
AFAIK, which one is "better" depends on context, portability, and personal
taste. :)
> Ben, since you're advocating the use of the $(...) construct, why didn't
> you take it further and provide an example ...
I did:
> let due=10#$(date +%j -d 04/01/2002)
Or did you mean an example of nesting? Um, pretty straight-forward:
FOO=$(expr $(date +%j) + 5)
which would set 'FOO' to the day-of-the-year plus five. (That is a really
contrived and stupid example, but I can't think of anything better right
now.)
> Just curious. My shell programming isn't what it could be, since perl
> almost always has an easier and more efficient way of doing things :)
Indeed. But until/unless someone comes up with a workable Perl command
shell, it still comes in useful. :-)
--
Ben Scott <[EMAIL PROTECTED]>
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