On 11/12/2011 07:53 AM, Geir Hauge wrote:
> 2011/11/12 Chris F.A. Johnson <ch...@cfajohnson.com>
>
>> On Fri, 11 Nov 2011, Peng Yu wrote:
>>
>>> I'm wondering if I already have a string variable, is there a bash
>>> native to do tilde expansion on it.
>>>
>>> var='~/..'
>>> cd $var#how to change this line?
>>>
>>
>> eval "cd $var"
>>
>
> I'd avoid eval as that could potentially do more than just expand the
> tilde, depending on what other characters the var contains. I'd just
> replace the ~ with $HOME using parameter expansion.
>
> cd "${var/#~\//$HOME/}"Except that your proposed parameter expansion only works for plain ~. It doesn't cover more useful tilde expansions, such as ~user/, which does NOT expand to $HOME, but to "user"'s home directory. -- Eric Blake ebl...@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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