Reusing output from last command in Bash

Question

Is the output of a Bash command stored in any register? E.g. something similar to $? capturing the output instead of the exit status.

I could assign the

Answer 1

Inspired by anubhava's answer, which I think is not actually acceptable as it runs each command twice.

save_output() { 
   exec 1>&3 
   { [ -f /tmp/current ] && mv /tmp/current /tmp/last; }
   exec > >(tee /tmp/current)
}

exec 3>&1
trap save_output DEBUG

This way the output of last command is in /tmp/last and the command is not called twice.