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Re: Avoid DoS vulnerability through unsafe default assignment
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From: |
Chet Ramey |
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Subject: |
Re: Avoid DoS vulnerability through unsafe default assignment |
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Date: |
Mon, 1 Aug 2022 09:40:26 -0400 |
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User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.11.0 |
On 7/31/22 2:10 AM, Bruno Haible wrote:
-: "${PERL='perl'}"
+: "${PERL="perl"}"
I had not expected that this would make a difference, but it does. This
sequence of commands
: "${F='perl'}"
echo "F=$F"
produces
F='perl'
POSIX is weird in some places...
Single quotes aren't special within double quotes.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/
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