schnippets/test_echo_log.sh

#!/usr/bin/env bash

# ${0} is the script name so this will output
# to the current directory as script_name.log
LOG_FILE="./${0}.log"

# Log all output to file
# tee -a - append
# tee -i - ignore interrupt signals
# STDOUT
exec > >(tee -ai ${LOG_FILE})
# STDERR
exec 2> >(tee -ai ${LOG_FILE})

# Copy the username@hostname working directory
# and command into the log file before the
# command is run
function echo_command () {
  # id -un - Output username
  # pwd - Print working directory
  # BASH_COMMAND - Command that's about to be run
  echo "$(id -un)@$(hostname) $(pwd) $ ${BASH_COMMAND}" >> ${LOG_FILE}
}
trap echo_command DEBUG

date
echo "Just echoed the date"
date
echo "Echoed it again"