Greg Wooledge wrote:
On Wed, Apr 11, 2012 at 02:34:01AM -0700, Linda Walsh wrote:
- for ((vl=$((v_level - 1)); $vl > 0; --vl))
The inside of the for ((...)) is already a math context. You don't need
another $((...)) inside it.
for ((vl = v_level - 1; vl > 0; --vl))
Or is that another "irrelevant detail"?
Um... Why do you think I included it --
I NEVER saw anything like that where [] was used... people
seem to not understand the (()) is arith, but you need $(()) to get
the value out of the insides...
But the examples of use of $(()) are leaning far more toward the perverse side
than simple use of $[]..
a few examples:
- options="$(expr "${options}" : "\(.\{$((${last_option_index}-1))\}\)")"
- YESTERDAY=$(date -r $((`date +%s` - 86400 )) +%d/%m/%Y
- PREGAP=$(($(echo $OFFSETS | cut -f1 -d' ')))
- for ((vl=$((v_level - 1)); $vl > 0; --vl))
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It's irrelevant to 'function', but not to efficiency or readability.
But hey, gold star for paying attention! ;-)
(those are all examples from various system scripts in /usr...
