exec > /vga/log/uninst_total_$(date +'%Y%m%d.%H%M%S').txt
ls

exec > tee /vga/log/uninst_total_$(date +'%Y%m%d.%H%M%S').txt
ls
# creates a file called 'tee' with output, nothing in terminal

exec | tee /vga/log/uninst_total_$(date +'%Y%m%d.%H%M%S').txt
ls
# creates file uninst_total_20150729.161010.txt but is empty, terminal is ok

exec 1> >(tee -a $LOGFILE)

exec 2>&1