Oracle Database Discussions

Hello All,
I am using the below syntax to call package in a unix shell script, is this right way of calling and checking for errors or is there any other better approach?? kindly suggest.
I am using Oracle 11g & Linux OS, SQL*Plus: Release 11.2.0.3.0 Production

   RETVAL=`sqlplus -s FCSDWH_STG/${DBSTG}@${DBSRC} <<EOF
        EXEC FCSDWH_STG.FCA_HASH_TOTALS_PKG.HASH_TOTALS_COMPUTE(${PROVIDER},${UNINUM},${EXTRACT_DT},${VER_NUM});
        EOF`
        if [ `echo ${RETVAL} | egrep "ERROR"` ]
        then
                logit "Error While Generating The SQLPLUS Output File, Please Check"
                exit 1
        else
                logit "SQLPLUS Output File Has Been Generated Successfully"
        fi

Thanks much.