shell脚本获取oracle pdb

#!/bin/ksh
 ###############################################################################################################
 #Script name: show_oracle_mode.sh
 #Script description: show oracle pdb name for multi pdbs.
 #Current Release Version: 1.0.0
 #Script Owner: 
 #Latest editor: 
 #Support platform:  Linux & AIX.
 #Change log:first version.
 #    
 #Descript:date 2021/8/17
 #
 #
 ###############################################################################################################
 load_sql="select cdb from v\$database;"
 show_pdbs="SELECT NAME FROM V\$PDBS where name not like 'PDB\$SEED';"
 open_mode=`sqlplus -S "/ as sysdba" <<EOF
 set feed off
 set heading off
 $load_sql
 exit;
 EOF`
 open_mode=`echo $open_mode | sed 's/[ \t]//g'`
 #echo $open_mode
 #res=`echo  "$open_mode"| awk  '{printf "%s\n", $0}'`
 #echo $res
 if [[ $open_mode == "YES" ]];then
     pdbs=`sqlplus -S "/ as sysdba" << EOF
 set feed off
 set heading off
 $show_pdbs
 exit
 EOF`
     for pdbname in $pdbs;do
         echo $pdbname
     done    
 elif [[ $open_mode == "NO" ]];then
     echo "open_mode is NO"
 else
     echo "open_mode does not exist."
     exit 1
 fi