Oracle backup for current date and time

orabackup.sh

# Callable script from an application. The directory is predefined in the backup folder. 
echo "Starting the export at "`date`
# su - oracle
#/home/oracle
#cd /DSSNEXP/
cd /u01/app/oracle/product/11.2.0/xe/bin
ORACLE_HOME=/u01/app/oracle/product/11.2.0/xe; export ORACLE_HOME
PATH=$ORACLE_HOME/bin:$PATH; export PATH
mkdir /home/backup
DATE=`date +%Y-%m-%d-%r`
echo $DATE
./exp userid=user/password@XE log=exp.log file=/home/backup/$DATE.dmp buffer=50000
echo "Export ended at "`date`