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Re: how does bash parse back-ticks, anyway?
From: |
Chet Ramey |
Subject: |
Re: how does bash parse back-ticks, anyway? |
Date: |
Fri, 20 Apr 2007 12:31:15 -0400 |
User-agent: |
Thunderbird 2.0.0.0 (Macintosh/20070326) |
Sven Mascheck wrote:
>> | echo ` echo $(
>> | cat <<\eof cat <<\eof
>> | a here-doc with ` a here-doc with )
>> | eof eof
>> | ` )
>> |
>> | echo ` echo $(
>> | echo abc # a comment with ` echo abc # a comment with )
>> | ` )
>
> BTW,
>
> My bash-3.2.15(1)/libc2.3.6/i686-pc-linux-gnu-2.6.13 (like previous
> releases) fails on the first $() example. It also fails if the
> here-doc contains a single, double or back quote instead of the ).
>
> "case x in x)" in $() is also not accepted; this is to be worked
> around with "case x in (x)" (POSIX is stricter, though).
These will be fixed in the next version of bash.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
Live Strong. No day but today.
Chet Ramey, ITS, CWRU chet@case.edu http://cnswww.cns.cwru.edu/~chet/