批量更改文件扩展名

# 将指定目录的所有 *.gif 文件都重命名为 *.jpg
#!/bin/bash
ERROR_BADARGS=65
case $# in
0|1) # "|"
echo "Usage: `basename $0` old_file_suffix new_file_suffix"
exit $E_BADARGS 
;;
esac
for filename in *.$1
do
mv $filename ${filename%$1}$2
done
exit 0