On Thu, 29 Jan 2009, Mark J. Reed wrote:
On Thu, Jan 29, 2009 at 5:54 PM, whitewall wrote:
#! /cygdrive/c/cygwin/bin/bash
declare -i Red
declare -i Green
Red=10
Green=$Red+1
Since you've declared both Green and Red as integer, you should just
do Green=Red+1, without the dollar sign. Doing Green=$Red+1 first
takes Red's value, which is stored as an integer, expands it back
into its decimal string representation, and then reparses it to
yield its integer value.
There IS one subtle difference. If you're running with "set -x",
Green=$Red+1
will echo
+ Green=10+1
But
Green=Red+1
will echo
+ Green=Red+1
(assuming that you've not changed PS4, IFS, &c &c). You can decide
which "set -x" output you like. I found that I preferred the
substituted forms, the ones with $this and $that.
--
Tim McDaniel, t...@panix.com
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