Centos8中如何更改文件夹中多个文件的扩展名

[root@localhost ~]# vim rename_file.sh
#!/bin/bash
echo "Enter the target directory "
read target_dir
cd $target_dir
 
echo "Enter the file extension to search without a dot"
read old_ext
 
echo "Enter the new file extension to rename to without a dot"
read new_ext
 
echo "$target_dir, $old_ext, $new_ext"
 
for file in *.$old_ext
do
    mv -v "$file" "${file%.$old_ext}.$new_ext"
done;

[root@localhost ~]# chmod +x rename_file.sh 
[root@localhost ~]# ./rename_file.sh 
Enter the target directory 
/root/test
Enter the file extension to search without a dot
txt
Enter the new file extension to rename to without a dot
log
/root/test, txt, log
renamed 'file10.txt' -> 'file10.log'
renamed 'file1.txt' -> 'file1.log'
renamed 'file2.txt' -> 'file2.log'
renamed 'file3.txt' -> 'file3.log'
renamed 'file4.txt' -> 'file4.log'
renamed 'file5.txt' -> 'file5.log'
renamed 'file6.txt' -> 'file6.log'
renamed 'file7.txt' -> 'file7.log'
renamed 'file8.txt' -> 'file8.log'
renamed 'file9.txt' -> 'file9.log'

[root@localhost ~]# cd /root/test/
[root@localhost test]# rename .txt .log *.txt

[root@localhost test]# rename .log .txt *.log