How can I find the File Name is Already Exists Using Shell Script

When you write a shell script and you want to find the file name is already exist in specific directory we can found using simple IF condition,

Find Single File is Exist?

For example i whould like to find the file name is "thelinuxfaq.txt" under root directory,

#!/bin/bash

if [ ! -f /root/thelinuxfaq.txt ]; then

    echo "The File not Found !!!"

fi

 #!/bin/bash

echo "Enter The File Name:"

read FILE_NAME



if [ ! -f /root/$FILE_NAME ]; then

    echo "The File not Found !!!"

fi

 #!/bin/bash

if [  -e  "/root/thelinuxfaq.sh"  -a  -e "/root/thelinuxfaq.html"  -a  -e  "/tmp/thelinuxfaq.txt"   ]

then

echo "Files are exist"

else

echo "Files can not be found"

fi