Bash unix command output as the variable

I need bash shell command output to the variable. For example, I got a command called repo-rate.sh and I need to output of that command stored to the variable named $output instead of the my server monitor. Is it possible?

$ cat /tmp/a.sh
echo aap
echo noot
echo mies

then
$ OUTPUT=$(/tmp/a.sh)
$ echo $OUTPUT
aap noot mies


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