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Re: Despite text in gnu bash manual, quote removal appears to be perform
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From: |
Eric Blake |
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Subject: |
Re: Despite text in gnu bash manual, quote removal appears to be performed on case pattern |
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Date: |
Sun, 10 Dec 2006 14:40:58 -0700 |
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User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.8) Gecko/20061025 Thunderbird/1.5.0.8 Mnenhy/0.7.4.666 |
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According to Stahlman Family on 12/10/2006 8:11 AM:
> Mingw (Msys) Bash 2.04.0(1)-release
Consider upgrading. Bash is now at 3.2, with a number of bugs fixed in
the meantime.
>
> $ case $dbg in
>> " foo bar ") echo "1" ;;
>> \ foo\ bar\ ) echo "2" ;;
>> esac
> 1
It appears you have found a bug in the POSIX specification. POSIX states:
http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_09_04
"In order from the beginning to the end of the case statement, each
pattern that labels a compound-list shall be subjected to tilde expansion,
parameter expansion, command substitution, and arithmetic expansion, and
the result of these expansions shall be compared against the expansion of
word"
but mentions quote removal for the word immediately after for. But
traditional behavior has always performed quote removal on the patterns,
and changing bash would break many existing scripts.
- --
Life is short - so eat dessert first!
Eric Blake ebb9@byu.net
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