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Re: Stumped on a question of scoping and unset.
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From: |
Andreas Schwab |
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Subject: |
Re: Stumped on a question of scoping and unset. |
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Date: |
Thu, 26 May 2011 17:40:40 +0200 |
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User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.3 (gnu/linux) |
Freddy Vulto <address@hidden> writes:
> On 09:11, Steven W. Orr wrote:
>> typeset $1 && upvars -a$nn $1 "address@hidden"
>>
>> The implication seems to be that the typeset command can fail. Is
>> this a reasonable thing to worry about?
>
> The idea is that a typeset - besides declaring a variable local -
> protects upvars from malicious variable names:
>
> $ typeset 'ls -l'
> bash: typeset: `ls -l': not a valid identifier
> $ echo $?
> 1
Unfortunately, that is subverted by the unquoted use of $1 above.
Andreas.
--
Andreas Schwab, address@hidden
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."