How to redirect stdout+stderr to one file while keeping streams separate?

Question

Redirecting stdout+stderr such that both get written to a file while still outputting to stdout is simple enough:

cmd 2>&1 | tee output_file
         


        

Answer 1

Victor Sergienko's comment is what worked for me, adding exec to the front of it makes this work for the entire script (instead of having to put it after individual commands)

exec 2> >(tee -a output_file >&2) 1> >(tee -a output_file)