COLD BACKUP batch file

We have scheduled a Cold backup of DR site: check the steps below
create a coldbackup.bat
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cd D:\oracle\product\10.2.0\db_1\BIN
sqlplus "sys/rock@rockstd as sysdba" @D:\COLDBACKUP_WEEKLY\coldbackup.sql
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steps for creating batch file: http://rakeshocp.blogspot.com/2007/09/batch-file-scripts.html
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coldbackup.sql
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ALTER DATABASE recover managed standby database cancel;
SHUTDOWN IMMEDIATE;
host MD F:\ROCKSTD_Coldbackup\"%DATE:/=_%"
host MD F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\DATAFILES
host MD F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\CONTROLFILES
host MD F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\REDOLOGS
host MD F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\ARCHIVELOGS
host MD F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\PARAMETERFILES
host copy D:\oracle\product\10.2.0\db_1\database\INITrockstd.ORA F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\PARAMETERFILES;
host copy E:\DATAFILES\*.DBF F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\DATAFILES;
host copy E:\REDOLOGS\*.LOG F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\REDOLOGS;
host copy E:\CONTROLFILES\*.CTL F:\ROCKSTD_Coldbackup\"%DATE:/=_%"\CONTROLFILES;
host copy E:\ARCHIVES\*.ARC F:\ROCKSTD_Coldbackup\"%DATE:/=_%\ARCHIVELOGS;
STARTUP NOMOUNT;
ALTER DATABASE MOUNT STANDBY DATABASE;
ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION;
exit;
exit