如何在Shell脚本中提取文件名和扩展名

#!/bin/bash

fullfilename=$1

filename=$(basename "$fullfilename")

fname="${filename%.*}"

ext="${filename##*.}"

echo "Input File: $fullfilename"

echo "Filename without Path: $filename"

echo "Filename without Extension: $fname"

echo "File Extension without Name: $ext"

$ ./script.sh /etc/apache2/apache2.conf

Input File: /etc/apache2/apache2.conf

Filename without Path: apache2.conf

Filename without Extension: apache2

File Extension without Name: conf