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Re: excess braces ignored: bug or feature ?


From: Chet Ramey
Subject: Re: excess braces ignored: bug or feature ?
Date: Sun, 19 Feb 2012 16:25:46 -0500
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On 2/17/12 6:22 PM, Dan Douglas wrote:

> My favorite is probably the parser ignoring any valid redirection syntax with 
> the special command substitutions.
> 
>  ~ $ { echo "$({xxxxxxxxxxxxxxxxxxxx}</dev/stdin)"; } <<<'hi'
> hi

Bash does the same thing as ksh93 here, though for the wrong reasons.
I think ksh93 counts an input redirection that saves the file descriptor
into a variable as sufficient to kick in the `equivalent to cat file'
clause.

>  ~ $ { echo "$(1111111111111111111111</dev/stdin)"; } <<<'hi'
> hi

This is a bug.  It should be a file descriptor out of range error, or
it should treat the string of digits as a word, since the value
exceeds the largest intmax_t.

> That one really is ignored. No variable named xxx... is actually set.

I assume you mean the first one.  It doesn't matter whether or not the
variable is set as a side effect of the redirection -- it's in a
subshell and disappears.

Chet
- -- 
``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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