Use this script to put an Oracle database into hot backup mode.

#!/bin/ksh
#
# script: backup_start.sh
#
# Sample script to put example Oracle database into hot backup mode.

export ORACLE_SID=dbase
export ORACLE_HOME=/oracle/816
export PATH=$ORACLE_HOME/bin:$PATH

svrmgrl <<!
connect internal
archive log list;
alter tablespace ts1 begin backup;

# .
# . Put all required tablespaces into hot backup mode
# .

alter tablespace tsN begin backup;
quit
!