Log script output to file and console

exec &> >(tee out.log)

exec > >(tee -i "/tmp/$0.log")
exec 2>&1

main() { ... }

main |& tee /tmp/$0.log

LOG_FILE=/tmp/test.log
LOG_FILE=${0##*/}
LOG_FILE="/tmp/${LOG_FILE%.*}.log"
exec > >(tee "${LOG_FILE}") 2>&1