How to extract filename and extension in bash shell script

	#!/bin/bash
	# get file name only without path
	file_name=$(basename $BASH_SOURCE)
	# get extension
	file_extension="${file_name##*.}"
	# get file name without extension
	file="${file_name%.*}"
	# print them to verify
	echo "Full input file : $BASH_SOURCE"
	echo "Filename only : $file_name"
	echo "File extension only: $file_extension"
	echo "First part of filename only, without extension: $file"

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[ec2-user@dockers ~]$ bash ~/test.sh
Full input file : /home/ec2-user/test.sh
Filename only : test.sh
File extension only: sh
First part of filename only, without extension: test