How do I reference the value of a constructed environment variable in a loop?
- by Rob Spieldenner
What I'm trying to do is loop over environment variables. I have a number of installs that change and each install has 3 IPs to push files to and run scripts on, and I want to automate this as much as possible (so that I only have to modify a file that I'll source with the environment variables). The following is a simplified version that once I figure out I can solve my problem.
So given in my.props:
COUNT=2
A_0=foo
B_0=bar
A_1=fizz
B_1=buzz
I want to fill in the for loop in the following script
#!/bin/bash
. <path>/my.props
for ((i=0; i < COUNT; i++))
do
<script here>
done
So that I can get the values from the environment variables. Like the following(but that actually work):
echo $A_$i $B_$i
or
A=A_$i
B=B_$i
echo $A $B
returns foo bar then fizz buzz
