How to check in Unix bash script if SAS log has any errors?

Hi everyone!
I am trying to do a few things in my bash script (script1.sh):  pass logicals/variables to my SAS program (program1.sas), execute SAS code (program1.sas), check with "errstat" for specific errors related to SAS code conditions that I set up in my SAS code, and also check with "logerrchk" SAS log file for any errors in the SAS log.  
I think most of the script is correct but I am not sure about both checking errors (errstat" and "logerrchk").

 Please note: variable/logicals (file1, file2, plog, and errstat) are also defined in the SAS program.  

 Please provide any suggestions or examples if you can.
 Here is what I have so far:

#!/bin/bash
#script1.sh

# Creating variables for directories
export DATADIR1=/root/alldirs/2018/data1
export DATADIR2=/root/alldirs/2018/data2
export DATADIR3=/root/alldirs/2018/data3
export PROGDIR1=/root/alldirs/2018/prog1

#Creating variables for data files that are used in program1.sas and final log file 
export file1=${DATADIR1}/sasdata1.sas7bdat
export file2=${DATADIR2}/sasdata2.sas7bdat
export plog=${DATADIR3}/sas_program.log

#executing SAS program
sas ${PROGDIR1}/program1.sas -log ${DATADIR3}/program1.log

#checking for errors in SAS log file
logerrchk=$?     
   if [[ "$logerrchk" !=0 ]]; 
   then 
       echo "--- Error: Abnormal end in program program1.sas. Check log file! ---" >> $plog
       exit 2
   else
       echo "--- Program1.sas run successfully! ---" >> $plog
   fi
  
#checking for specific errors that are related to SAS code conditions
while IFS=read -r rec; do

errstat=${rec:0:1}
done < $errstat

   if [[ "$errstat" ==0 ]]; 
   then 
       echo "--- All calculations in Program1.sas are successful! ---" >> $plog  
       exit 2
   else
       echo "---  Program1.sas has a problem with some calculations. Check log file! ---" >> $plog
   fi
exit 0

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Please let me know if anything in this script can be done differently or in a more efficient way.

Any suggestions would be appreciated!
Thank you!