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Shell Programming and Scripting

Runtime variable extraction

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# 1  
Old 12-19-2014
Runtime variable extraction
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  
Old 12-19-2014
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  
Old 12-19-2014
Thanks for the reply.

eval did the trick.

Thanks anyway
# 4  
Old 12-19-2014
Please use code tags as required by forum rules!

With a recent bash, you can try
Code:
for i in var{1..4}; do temp=${!i}; echo "$temp"; done
value1
value2
value3

# 5  
Old 12-19-2014
Quote:
Originally Posted by RudiC
Please use code tags as required by forum rules!

With a recent bash, you can try
Code:
for i in var{1..4}; do temp=${!i}; echo "$temp"; done
value1
value2
value3

You can, the question is should you when there's a perfectly good array construct available?
# 6  
Old 12-19-2014
Quote:
Originally Posted by Skrynesaver
You can, the question is should you when there's a perfectly good array construct available?
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.
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