Can someone please help me with this script, I'm trying to create system backup on AIX, for this I want to first mount the filesystem if it is not mounted, then create the backup and unmount the filesystem but I'm having problem while using the mail command to notify the status of filesystem whether it can be mounted or not, it doesn't send an email and doesn't append anything to the log files, also how do I calculate the time the script is taking to complete, is there a command I can use within the script ?

#!/usr/bin/ksh
set -x
HOSTNAME=$(hostname)
fs=$(df|grep testfs | awk '{print $7}')
if [ -z "$fs" ]; then
echo "Mounting filesystem..."
mount /testfs
mail -s "Filesystem mounted with success" -c "xxx@email1 yyy@email2"</var/log/succes.err >/dev/null
else
mail -s "No such filesystem exists on $HOSTNAME" -c "xxx@email1 yyy@email2"</var/log/miss.err >/dev/null

exit
fi

## If cannot mount then run,
if [ $? -ne 0 ]; then
mail -s "Cannot mount filesystem for $HOSTNAME" -c "xxx@email1 yyy@email2"</var/log/fail.err >/dev/null
exit
fi