I tried below shell code to get the value of temp as "good 1" and "good 2", but I was not able to.
hello_1="good 1"
hello_2="good 2"
for i in 1 2
do
temp="hello_$i"
echo $temp
done
I want to fetch hello_1 and hello_2 variables value into temp variable.
I tried above script but I was not able to get values of hello_1 and hello_2 into temp. please help me.
If you using bash 4 or higher, read about indirect references. But to answer your question you can do
hello_1="good 1"
hello_2="good 2"
for i in 1 2
do
eval temp="\$hello_$i"
echo $temp
done
output
good 1
good 2
eval is usually considered evil in shell programming. Don't get in a habit of using it.
The key technique is that the eval provides a 2nd evaluation of the line. On the first pass it looks like
eval temp="$hello_1"
Note how the $i is displayed as 1, AND that the leading \\ char is removed from \$hello_1, so
when the eval is executed the processing of the line takes the value of $hello_1 variable and assigns it to temp, i.e.
temp="good 1"
IHTH
