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Re: [Help-bash] make function local


From: Chet Ramey
Subject: Re: [Help-bash] make function local
Date: Sat, 11 Apr 2015 13:27:53 -0400
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On 4/10/15 11:09 AM, Greg Wooledge wrote:
> On Fri, Apr 10, 2015 at 09:13:17AM -0500, Eduardo A. Bustamante López wrote:
>> Now, for the features in bash that'd be actually useful:
>>
>> - discipline functions and compound datatypes (like in ksh)
>> - a way to do wrap arbitrary OS system calls with a builtin, so that instead 
>> of
>> having thousands of builtins each interacting with the system, we could just
>> do: `syscall lstat foo' and get something useful.
> 
> (Even adding *just* examples/loadables/finfo as a standard builtin would
> be so helpful!  But we also get a huge number of requests for readlink.)
> 
>> - a faster implementation of the variable lookup code
>> - a shopt to disable evaluation of shell code in places like arithmetic
>> expansion
>> - a better way to deal with binary input (specially NUL bytes)
>> - and many more, these are the ones I can think of right now
> 
> Yeah, same here.  I didn't know I was going to be quizzed on this, or
> I would have studied.
> 
> - Fix the $"..." security hole (I tried and failed).
>   http://www.gnu.org/software/gettext/manual/html_node/bash.html

Yeah, I didn't like the all-or-nothing choice the patch implemented.  If
command substitution is the problem, a better approach would have been to
inhibit command substitution instead of every word expansion.  That's just
not easy to do at the point where locale transformation gets done -- it
requires processing the translated string to insert some kind of quoting.

-- 
``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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