Re: [Help-bash] bash variable interpolation

[Chet Ramey]

On 3/19/15 6:04 PM, Peng Yu wrote:
> Hi,
> 
> I want to interpolate variable in a bash string variable. But the
> following code shows the spaces are not maintained. There is some
> built-in features in perl to do string interpolation. Does anyone know
> the best way to do string interpolation in bash? Thanks.

This seems much more complex than necessary.  You're using eval, which is
going to require a second set of escaped quotes to account for the second
set of word expansions.

What's wrong with something like

str="$x  $y  $z"

and then using

echo "$str"?

Do you require the delayed evaluation?

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/