How to take RMAN Backup using Shell Script

Create directory structure to keep rman backup

mkdir -p /oracle/stage/rman

Create RMAN backup script file

RMAN backup script to take DB FULL backup

vi /home/oracle/full_backup.sh

#!/bin/bash

. /home/oracle/.bash_profile

export ORACLE_SID=PROD
export ORACLE_HOME=/u01/app/oracle/product/11.2.0
export DATE=$(date +%y-%m-%d_%H%M%S)

rman target / log=/home/oracle/prod_${DATE}.log << EOF
run
{
allocate channel ch1 device type disk format '/oracle/stage/rman/prod_full_bkp_%u';
allocate channel ch2 device type disk format '/oracle/stage/rman/prod_full_bkp_%u';
delete noprompt obsolete;
backup database;
backup archivelog all delete input;
release channel ch1;
release channel ch2;
}
EOF

Schedule Backup Under Crontab

Give execute permissions on the shell script

chmod 775 /home/oracle/full_backup.sh

crontab -e

Schedule to run at 11 PM Daily

00,23 * * * /home/oracle/full_backup.sh

Another format

#!/bin/bash

export ORACLE_SID=your_db_sid
export ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1
export PATH=$ORACLE_HOME/bin:$PATH
DATESTAMP=$(date +%Y%m%d_%H%M%S)

BACKUP_DIR=/u02/rman_backups

mkdir -p $BACKUP_DIR

rman target / <<EOF
RUN {
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '$BACKUP_DIR/ctrlfile_%F.bkp';

BACKUP AS COMPRESSED BACKUPSET
DATABASE FORMAT '$BACKUP_DIR/datafile_%d_%T_%U.bkp'
TAG 'FULL_DB_BACKUP';

BACKUP ARCHIVELOG ALL DELETE INPUT
FORMAT '$BACKUP_DIR/archivelog_%d_%T_%U.bkp'
TAG 'ARCHIVELOG_BACKUP';

BACKUP CURRENT CONTROLFILE
FORMAT '$BACKUP_DIR/controlfile_%d_%T_%U.bkp'
TAG 'CONTROLFILE_BACKUP';
}
EXIT;
EOF