sqlloader failure with unique constraint

Hi,

I am running the below script from unix and the sqlloader command fails, Can I request to let me know how to handle this error.
My Code:
sqlldr userid="$1" control=Control/$l_control.control.txt data="$2/$p.txt" log=log/$v_log.log bad=log/$v_log.bad silent=header,feedback

     retcode=`echo $?`
     echo $retcode
        case "$retcode" in
          0) echo "SQL*Loader execution successful" ;;
          1) echo "SQL*Loader execution exited with EX_FAIL, see logfile" ;;
          2) echo "SQL*Loader exectuion exited with EX_WARN, see logfile" ;;
          52) echo "SQL*Loader Discarding some rows, but I do not care " ;;
          3) echo "SQL*Loader execution encountered a fatal error" ;;
          *) echo "unknown return code";;
           esac
echo "Data Load Completed successfully for " $t $p

But still I am unable to handle the below error, I need to ignore any bad records and progress further. Please suggest

Record 1872: Rejected - Error on table DWDM_SUBRACK.
ORA-00001: unique constraint (T2100.DWDM_SUBRACK_PK) violated

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My Code: 
sqlldr userid="$1" control=Control/$l_control.control.txt data="$2/$p.txt" log=log/$v_log.log bad=log/$v_log.bad silent=header,feedback
 
     retcode=`echo $?`
     echo $retcode
        case "$retcode" in
          0) echo "SQL*Loader execution successful" ;;
          1) echo "SQL*Loader execution exited with EX_FAIL, see logfile" ;;
          2) echo "SQL*Loader exectuion exited with EX_WARN, see logfile" ;;
          52) echo "SQL*Loader Discarding some rows, but I do not care " ;;
          3) echo "SQL*Loader execution encountered a fatal error" ;;
          *) echo "unknown return code";;
           esac
echo "Data Load Completed successfully for " $t $p