You may need to set the Oracle environment like this:
Code:
logfl=$filename.log.$MYTIME
badfl=$filename.badfile
datfl=$MYFILE
dscfl=$filename.discard
user=$SECUID/$SECPWD@$SECSID
ctlfl=/control/$filename.ctl

ORAENV_ASK=NO
export ORACLE_SID=$SECSID  # Or a local SID if $SECSID is remote.
. /usr/local/bin/oraenv

echo " Loading table $filename "

sqlldr $user $ctlfl log=$logfl bad=$badfl data=$datfl discard=$dscfl
rc=$?
echo .
echo " Completed loading into $filename return code = $rc "