AWK : To print any non empty line if present

 #! bin/bash
#To print any non empty line if present

echo "enter a filename to print from awk"
read fileName
if [[ -f $fileName ]]
then
        awk ' NF < 0 ' $fileName
        echo "==============================================================="
else
    echo "$fileName doesn't exist"
fi



[prabhucloudxlab@cxln4 ~]$ sh hello.sh
enter a filename to print from awk
filegrep.txt