read OLD_STDOUT OLD_STDERR<<<$(lsof -a -d1,2 -p$$ -F|sed -ne "s/^n\(.*\)/\1/p")
ADDITIONAL_LOG=/home/upgrade_details-$(date +"%Y%m%d%H%M").log

function __enable_detail_log() {
	exec 1> >(tee -a $ADDITIONAL_LOG )
	exec 2> >(tee -a $ADDITIONAL_LOG >&2 )
}

function __disable_detail_log() {
	exec 1>$OLD_STDOUT 
	exec 2>$OLD_STDERR
}

__enable_detail_log