Write STDOUT & STDERR to a logfile, also write STDERR to screen

Question

I would like to run several commands, and capture all output to a logfile. I also want to print any errors to the screen (or optionally mail the output to someone).

Answer 1

add this at the beginning of your script

#!/bin/bash
set -e 
outfile=logfile

exec > >(cat >> $outfile)
exec 2> >(tee -a $outfile >&2)

# write your code here

STDOUT and STDERR will be written to $outfile, only STDERR will be seen on the console