Rman backup script

#!/bin/bash

export ORACLE_SID=orcl_1
export ORACLE_BASE=/u01/app/oracle
export PATH=/u01/app/oracle/database/product/11.2.0/dbhome_1/bin:/u01/app/11.2.0/grid/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/home/oracle/bin
export ORACLE_HOME=/u01/app/oracle/database/product/11.2.0/dbhome_1

basedir=/u01/app/oracle/backup
host=`hostname`
backup_dir=`date '+%Y.%m.%d'`

filename=`date '+%Y.%m.%d_%H.%M.%S'`

test -d ${basedir}/${host}/${backup_dir} || mkdir -p ${basedir}/${host}/${backup_dir}


if [ "x$1" = "x0" -o "x$1" = "x1" ]; then
inclevel=$1

rman target / log=${basedir}/${host}/${backup_dir}/backup_${filename}.log << !
run {
allocate channel c1 device type disk;
allocate channel c2 device type disk;
allocate channel c3 device type disk;
allocate channel c4 device type disk;
backup as compressed backupset incremental level ${inclevel} database format '${basedir}/${host}/${backup_dir}/data_lv${inclevel}_${filename}.%U';
backup as compressed backupset archivelog all delete all input format '${basedir}/${host}/${backup_dir}/arch_${filename}.%U';
backup as compressed backupset current controlfile format '${basedir}/${host}/${backup_dir}/control_${filename}.%U';
backup spfile format '${basedir}/${host}/${backup_dir}/spfile_${filename}.%U';
delete noprompt obsolete recovery window of 7 days;
}
!

else

rman target / log=${basedir}/${host}/${backup_dir}/backup_${filename}.log << !
run {
allocate channel c1 device type disk;
allocate channel c2 device type disk;
backup as compressed backupset archivelog all delete all input format '${basedir}/${host}/${backup_dir}/arch_${filename}.%U';
backup as compressed backupset current controlfile format '${basedir}/${host}/${backup_dir}/control_${filename}.%U';
backup spfile format '${basedir}/${host}/${backup_dir}/spfile_${filename}.%U';
delete noprompt obsolete recovery window of 7 days;
}
!

fi