severity 599871 wishlist
quit
Hi again,
Joel Roth wrote:
> $ perl -e "system('cat 2>&1>/dev/null &')"
> sh: Syntax error: redirection unexpected
Hmm, standards are hard to read. :( What I had missed:
"The following grammar defines the Shell Command Language. This formal
syntax shall take precedence over the preceding text syntax
description.
2.10.1 Shell Grammar Lexical Conventions
[...]
3. If the string consists solely of digits and the delimiter character
is one of '<' or '>' , the token identifier IO_NUMBER shall be
returned."
The example tokenizes as
WORD{cat} IO_NUMBER{2} GREATAND{>&} IO_NUMBER{1} '>' WORD{/dev/null} '&'
or in more conventional terms,
cat 2>& 1>/dev/null &
which is malformed, since there is no WORD following the >& operator.
Although it would be possible to parse this differently without
breaking conforming applications, it is not clear that that would
render dash any better at what it is designed to do (which is to be
fast and POSIX-compliant).
Thanks again, and sorry for the confusion.
Jonathan
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