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Re: Doc of "set -e" should mention non-locality

From: Chet Ramey
Subject: Re: Doc of "set -e" should mention non-locality
Date: Thu, 05 Jul 2012 12:07:44 -0400
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On 7/5/12 11:55 AM, Dan Douglas wrote:

>> Remember that my main suggestion is to clearly document the intended
>> behavior (see the subject). This could mean to add a generic
>> paragraph to the documentation of "set" that describes the scope
>> and extent for all options. 
> I'm all for better documentation. Scope in Bash is a complex subject. Almost 
> none of it is documented, and there is little standardization around how 
> function scope is supposed to work anyway. I'd call set -e a low priority 
> relative to documenting what scope behaviors are actually in place.

There really isn't that much scope.  Posix barely acknowledges the
existence of scopes, period.  It doesn't have local variables, options,
or traps.

The paragraph in the bash man page describing the behavior of the ERR,
DEBUG, and RETURN traps, and the various descriptions of local variables,
are about it.

Bash's use of dynamic scoping is where the complexity comes in, I think,
but the implementation is, I hope, consistent.

- -- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/

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