bug-bash
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: incorrect brace expansion when using default values


From: Tatavarty Kalyan
Subject: Re: incorrect brace expansion when using default values
Date: Thu, 7 Sep 2006 14:20:43 +0800

On 9/6/06, Chris F.A. Johnson <address@hidden> wrote:

On 2006-09-06, Andreas Schwab wrote:
> address@hidden (Paul Jarc) writes:
>
>> Mike Frysinger <address@hidden> wrote:
>>> this little bit of code doesnt work right:
>>> foo() { echo "${1:-a{b,c}}" ; }

  The first '}' is interpreted as the end of the parameter expansion.

>>
>> Brace expansion happens before parameter expansion (man bash,
>> EXPANSION).
>
> Brace expansion doesn't come into play here, because the braces are
> quoted.

  Quote them, and they do expand:

$ foo() { echo "${1:-"a{b,c}"}" ; }
$ foo
ab ac

  However, there is a problem:

$ foo 1
1 1

  Where is the second '1' coming from?

It seems

foo() { echo "${1:-"a{b,c}"}" ; } expands to

foo() { echo ${1:-ab} ${1:-ac} ; }

--
  Chris F.A. Johnson                      <http://cfaj.freeshell.org>
  ===================================================================
  Author:
  Shell Scripting Recipes: A Problem-Solution Approach (2005, Apress)


_______________________________________________
Bug-bash mailing list
address@hidden
http://lists.gnu.org/mailman/listinfo/bug-bash



reply via email to

[Prev in Thread] Current Thread [Next in Thread]