Here is a script that I wrote some time ago that does a auto-reply.
You could try and work this into the way you are presently doing it.
You may have to make some modifications to fit your needs.

Mark Adams

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*
TMPFILE=/tmp/adsmact.log
ADSMCMD='dsmadmc -id=user -password=password'
#${ADSMCMD} checkin libvolume OMASPCTAPLIB0 $1 checklabel=yes status=scratch
${ADSMCMD} LABEL libvolume omaspctaplib0 search=bulk labelsource=barcode
checkin=scratch overwrite=yes
if [ $? != 0 ]
then
     echo "There was a problem with the tape drive -- Check the activity log
to find the problem"
     exit 1
fi

############################################################################
##
### WATCH ACTIVITY LOG TO OBTAIN REPLY NUMBER
############################################################################
##
clear
echo "PLEASE WAIT ---- Checking activity log."
while true
do
    ${ADSMCMD} query actlog begintime=now-0:01 endtime=now msgno=8373 >
${TMPFILE}
    if [ $? = 0 ]
    then
      break
    fi
    sleep 30
done

REPLY=`grep ANR8373I ${TMPFILE} | awk '{print $4}' | cut -c1-3`
${ADSMCMD} reply ${REPLY}
if [ $? != 0 ]
then
     echo "There was a problem with the reply -- Check the activity log to
find the problem"
     exit 2
fi

############################################################################
##
### WATCH ACTIVITY LOG TO SEE IF CHECKIN WAS SUCCESSFUL
############################################################################
##
while true
do
    clear
    echo "Checking activity log."
    ${ADSMCMD} query actlog begintime=now-0:01 endtime=now msgno=8810 >
${TMPFILE}
    if [ $? = 0 ]
    then
      cat ${TMPFILE}
      echo "Checking activity log for a succesful check in."
      while true
      do
         ${ADSMCMD} query actlog begintime=now-0:01 endtime=now msgno=8427 >
${TMPFILE}
         if [ $? = 0 ]
         then
           cat ${TMPFILE}
           echo "Checkin of libvolume $1 was unsuccessful"
           exit 0
         fi
      done
      break
    fi
    sleep 30
done
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