[URGENT] Determines a file is a NORMAL text file

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Error [URGENT] Determines a file is a NORMAL text file

I assign the variable
name=`find . -type f | awk -vR=$num '{if (NR == R) {print; exit}}`

which returns the name of a file in "$num" ordered in the folder to the variable $name.
I want to use IF and determine if the file is a NORMAL text file (does not contain an extension), the command will display the file content, ELSE, exit the script.
What command can I use?
Thanks in advance.
# 2  
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