シェルスクリプトでバッチファイルを簡単に作成・変更する方法

#! /bin/bash
##########################################################
#File Name:create_file.sh
#Version:V1.0
#Aurhor:
#Emali:
#Created Time:2021-06-15 02:56:59
#Description: create files & modify files
##########################################################


if [ -d /python ];then
   cd /python
else
   mkdir /python
   cd /python
fi
for i in {1..12}
do
   file_name=$(echo $RANDOM |md5sum |cut -c 1-8)
   touch ${file_name}_hcip.py
done

for files in $(ls /python)
do
     file1=$(echo $files |cut -d '_' -f1)
     mv $files ${file1}_hcie.PY
done

[root@control python]# /scripts/create_file.sh 
[root@control python]# ll
total 0
-rw-r--r-- 1 root root 0 Jun 15 04:26 4272db00_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 51989a58_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 75075364_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 7a272319_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 7d76af2f_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 977e73d6_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 9e4386a0_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 a35d5337_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 b9cb6458_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 b9d3349e_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 c3e589a2_hcie.PY
-rw-r--r-- 1 root root 0 Jun 15 04:26 e4f82be8_hcie.PY

#! /bin/sh
for ((i=0;i<=10;i++))
do
    touch ${i}.jpeg
done

#! /bin/sh
oldsuffix="jpeg"
newsuffix="jpg"
dir=$(eval pwd)

for file in $(ls $dir | grep . ${oldsuffix})
    do
        name=$(ls ${file} | cut -d. -f1)
        mv $file ${name}. ${newsuffix}
    done
echo "change jpeg to jpg successd!"