On Tuesday 05 September 2006 19:01, Paul Jarc wrote:
> Mike Frysinger <[EMAIL PROTECTED]> wrote:
> > this little bit of code doesnt work right:
> > foo() { echo "${1:-a{b,c}}" ; }
>
> Brace expansion happens before parameter expansion (man bash,
> EXPANSION). So the first "}" ends the parameter expression, and the
> second "}" isn't special. The result of parameter expansion is not
> subject to brace expansion.
i dont think order is why it's behaving differently from what i expect ...
after all, if brace expansion happened before the parameter expansion, it
should have assigned "ab ac" as the default value, not "a{b,"
i think this little tidbit is what matters:
Parameter Expansion
When braces are used, the matching ending brace is the first `}' not
escaped by a backslash or within a quoted string, and not within an
embedded arithmetic expansion, command substitution, or parameter
expansion.
since brace expansion is not listed here as an exception, the behavior i'm
seeing is correct
> > $ foo
> > a{b,c}
>
> This is correct. "a{b,c" is the default value, and "}" follows the
> parameter expression.
>
> > $ foo 1
> > a}
>
> I get "1}".
sorry, yes this is what i get ... i was hand typing the e-mail ;)
-mike
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