Shell Programming and Scripting

cd /temp
for i in aa bb cc dd
do
fname=$(ls sample_${i}_test | wc -l)
if [ $fname -eq 4 ]
then
echo "There are "$fname" files present in temp"
fi
done

for i in aa bb cc dd
do
  fname="${fname} sample_${i}_test"
done
cd /temp
if [[ $(ls -l ${fname} | wc -l) -eq 4 ]]; then
  echo "${fname} files are available in /temp"
fi

cd /temp    # Did you really mean /tmp???
fcnt=0
for i in aa bb cc dd
do      if [ -e "sample_${i}_test" ]
        then    fcnt=$((fcnt + 1))
        fi
done
if [ $fcnt -eq 4 ]
then    echo "There are $fcnt files present in /temp"
else    echo "There are only $fcnt files present in /temp; try again later."
        exit 1
fi
echo 'Continue processing...'

ls -ltr | awk '/test_testaa|bb|cc.txt/ {a++} END{ {if(a > 3) {print "files have been found."} else {print "files have not been found."}} }'

cd /temp;ls | awk '/^sample_(aa|bb|cc|dd)_test$/ {a++} END{if(a > 3) print "files have been found."; else print "files have not been found."}'