Bash Utility to rename all the Files in a Folder

I wanted to rename all the files in a folder - from the extension .jpeg to .jpg and was looking to automate as there were roughly more than 20 files :)

The below script will help you rename all the files with an extension .jpeg to .jpg in the linux flavored terminal.

Bash Script

#!/bin/bash

for file in *.jpeg; do
    mv "$file" "$(basename "$file" .jpeg).jpg"
done

It is a simple for loop that is self explanatory - where it picks up all the files matching with the desired file extension (.jpeg). Inside the loop, it moves the file extension from .jpeg to .jpg.

Command Execution and Output

Verify the file extensions before executing the Bash script.

RAGHS_BASH: ls
 00.jpeg   05.jpeg   10.jpeg   15.jpeg                   20_Receipt.jpeg
 01.jpeg   06.jpeg   11.jpeg   16.jpeg                   21.jpeg
 02.jpeg   07.jpeg   12.jpeg   17.jpeg                   22_RaghsPrsnlPHPExpenses_Summary.jpeg
 03.jpeg   08.jpeg   13.jpeg   18_Payment_Success.jpeg   changeExtn.sh
 04.jpeg   09.jpeg   14.jpeg   19.jpeg           
RAGHS_BASH:

Now verify the file contents once.

RAGHS_BASH : bat changeExtn.sh
───────┬────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: changeExtn.sh
───────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ #!/bin/bash
   2   │
   3   │ for file in *.jpeg; do
   4   │     mv "$file" "$(basename "$file" .jpeg).jpg"
   5   │ done
   6   │
───────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Execute the script and verify the file contents.

RAGHS_BASH : ./changeExtn.sh
RAGHS_BASH : ls
 00.jpg   05.jpg   10.jpg   15.jpg                   20_Receipt.jpg
 01.jpg   06.jpg   11.jpg   16.jpg                   21.jpg
 02.jpg   07.jpg   12.jpg   17.jpg                   22_RaghsPrsnlPHPExpenses_Summary.jpg
 03.jpg   08.jpg   13.jpg   18_Payment_Success.jpg   changeExtn.sh
 04.jpg   09.jpg   14.jpg   19.jpg                  
RAGHS_BASH :

It only filtered all the files ending with the .jpeg extension, leaving the other files untouchedd - for example, changeExtn.sh - this file, and renamed all the matching files as desired.

Cheers,
RM…
Raghavan alias Saravanan Muthu
21 Nov 2022 | Mon | 23:42:37 PM IST