From mboxrd@z Thu Jan  1 00:00:00 1970
From: Harald van Dijk <harald@gigawatt.nl>
Subject: Re: Quoted closing brace in variable default expansion
Date: Sat, 20 Nov 2010 01:42:33 +0059
Message-ID: <4CE71991.3020108@gigawatt.nl>
References: <20101119135406.GA24391@gondor.apana.org.au>
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Cc: Herbert Xu <herbert@gondor.apana.org.au>, jrnieder@gmail.com

On 19/11/10 14:53, Herbert Xu wrote:
> Harald van Dijk<harald@gigawatt.nl>  wrote:
>>    sh -c 'echo "${x:-\}}"'
>
> If you need to print anything involving a backspace you should
> use printf and not echo.

It's true that backslashes should not be passed to echo, but assuming 
unset or empty x, "${x:-\}}" should expand to "}", and that is all echo 
should see.

Cheers,
Harald