Re: [Help-bash] bash variable interpolation

[Dave Rutherford]

On Thu, Mar 19, 2015 at 7:37 PM, Peng Yu <address@hidden> wrote:
> On Thu, Mar 19, 2015 at 5:42 PM, Eric Blake <address@hidden> wrote:
>> On 03/19/2015 04:04 PM, Peng Yu wrote:
>>> I want to interpolate variable in a bash string variable. But the
>>> following code shows the spaces are not maintained.
>>
>> Insufficient quoting on your part.
>>
>>> 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.

I feel dumb. What is meant by `string interpolation'?

> The real problem is that I want to replace some bash variables in a
> file and then print the output.

Can you arrange things so that the file is given as a here-document?
Here-documents are treated to variable expansion, and the results
ought to be safe regardless of the variable contents.