How to log entire output from a shell script

I have recently used exec to send all output from a bash script to a designated logfile.

For example, if you have a complex script which performs multiple tasks and even execute tasks under a different user along the way, all the output will go into the global logfile indicated by the $GLOGFILE variable:

#!/bin/bash
export SCRIPT_NAME=`basename $0`
export TS=`date +\%m.\%d.\%y\_%H_%M_%S`
export GLOGFILE=/u01/mylogfile_${TS}.log
touch ${GLOGFILE}
chmod 666 ${GLOGFILE}
exec 1> ${GLOGFILE} 2>&1
echo "Starting job at " `date`

your shell instructions here

echo "Ending job at " `date`
exit

Good sources:

Linuxfordevices.com

Geeksforgeeks.org