Rename all Files in the Directory

Here is the simple shell script to rename all files in the folder with increasing number.

In below example I am going to rename all jpg image with increasing number.

#!/bin/bash
a=1
for i in *.jpg; do
  new=$(printf "%04d.jpg" "$a")
  mv -- "$i" "$new"
  let a=a+1
done

Output:

0001.jpg
0002.jpg
0003.jpg
0004.jpg
0005.jpg
0006.jpg
0007.jpg
0008.jpg
0009.jpg
0010.jpg

Few more Linux reference

https://github.com/roopendra/devops/tree/master/bash_scripting