Bash variables expansion

olaola · 10-16-2006, 11:08 AM

Hi guys,
I'm dealing with a studip problem, as stupid as I can't resolve it

Here's the question.
I have a varible containing the name o a second variable:

Code:

var2="blablabla"
var1='$var2'
echo $var1

give obviously

Code:

$var2

.

The question is, how can I obtain "blablabla" manipulating var1?

thank in advance

olaola

druuna · 10-16-2006, 11:12 AM

Hi,

You don't need the quotes:
var1=$var2

Or if you want/need quotes, use double quotes:
var1="$var2"

In general: All between single quotes is not expanded and all between double quotes is expanded.

Hope this helps.

olaola · 10-16-2006, 11:16 AM

sorry, maybe my question is not so clear, but I read var1 from a file and is value is exactly $var2 (with dollar symbol)

then I need to extract value of var2 from var1

thank for the answer

druuna · 10-16-2006, 11:42 AM

Hi,

You could use the eval command:

var2="blablabla"
var1='$var2'
echo $var1
eval echo $var1

Hope this helps.

olaola · 10-16-2006, 11:45 AM

perfect!
thanks a lot!!!