Re: Problem with Windows 1.12.13 binary

[Derek R. Price]

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Jim Hyslop wrote:
> On a tangent - I'm currently (ahem) `bash`ing my head trying to get
> some simple stuff working <Jim ducks to avoid flying objects>. Any
> suggestions for getting up to speed with shell programming? What I
> need is something that will help me understand subtleties like
> scope of variables. For example, in this code snippet:

Not sure what you are bashing your head against here.  I thought all
shell variables were globals, except the $@ ($1, $2, etc.) arguments
set at the entrance of scripts and functions.  Period.  Of course, you
can get apparently smaller scopes by launching subshells, but those
are just globals too and you lose access to any previous globals you
didn't `export'.  I generally launch subshells explicitly (var=$( ...
), or var=` ... ` to gather output), but you probably invoked an
implicit subshell by using the pipe.

Not sure what references to direct you to.  I generally use `info
bash` for general issues.  There is a really good section in the
Autoconf manual on the portability of various shell constructs.  I
reference it a lot.  `info Autoconf', then select the chapter on
"Portable Shell" from the main menu.  The capital "A" in `info
Autoconf' has been important for a few releases.  See
<http://www.gnu.org/software/autoconf/manual/autoconf-2.57/html_chapter/autoconf_10.html#SEC114>
for the online version of the chapter in question.

Cheers,

Derek
- --
Derek R. Price
CVS Solutions Architect
Get CVS support at Ximbiot <http://ximbiot.com>!
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