#!/usr/bin/sh
Scripts=/ushhquest/data001/Scripts
 
cd /ushhquest/data011/TgtFiles/MonthlyData
ls CUSTADDR*.txt > sample_txt_files
while read line
do
srcfile="/ushhquest/data012/TgtFiles/BMMonthlyData"$line
tgtfile=/ushhquest/data012/TgtFiles/BMMonthlyData/output.txt
awk -F, '$3 =="" {next;}1' $srcfile >> $tgtfile
if [[ $(awk -F, '$3 =="" {print;exit}' $srcfile) ]]
then
echo $srcfile >> output_file # Here you get all the files which has $3 blank
fi
#rm -f $srcfile # You don't need rm here...
mv $tgtfile $srcfile
done<sample_txt_files
rm -f sample_txt_files
echo "completed"