Bash, weird variable scope when populating array with results

Question

I am parsing command output and putting results into array.

Works fine until exiting the inner loop - output array is empty.

declare -a KEYS

#------         


        

Answer 1

When you use a pipe (|) to pass your command output to while, your while loop runs in a subshell. When the loop ends, your subshell terminates and your variables will not be available outside your loop.

Use process substitution instead:

while read line; do
   # ...
done < <($glue_dir/get_keys $ip)