Runtime variable extraction

Shell Programming and Scripting
1

Hi There,

var1=value1
var2=value2
var3=value3

for (( i=1; i<4; i++ ))
do
temp=var$i
echo "$temp"
done

OUTPUT
var1
var2
var3

I want the output to be
value1
value2
value3

How can I achieve this?

Regrads
Jagpreet

2

There's a specific construct called an array which associates values with an index, assuming this is a bash script, take a look at the chapter on arrays in the bash beginners guide otherwise do a search for arrays in the documentation of this shell

3

Thanks for the reply.

eval did the trick.

Thanks anyway

4

Please use code tags as required by forum rules!

With a recent bash, you can try

for i in var{1..4}; do temp=${!i}; echo "$temp"; done
value1
value2
value3
5

You can, the question is should you when there's a perfectly good array construct available?

6

Depends on the problem being solved, which we know nothing about. Arrays are used to solve far too many "problems" in shell, sometimes used to excess.