HowTo: Unix / Linux Rename File Extension From .OLD to .NEW

To rename a file extension from .OLD to .NEW in Unix or Linux, you can use the mv (move) command along with string substitution and a shell loop. Here is an example using a shell script:

#!/bin/bash

for f in *.OLD; do
n mv "$f" "${f%.OLD}.NEW"
done

This script will loop through all files with a .OLD extension in the current directory and rename them with a .NEW extension using the mv command. The ${f%.OLD}.NEW syntax uses string substitution to remove the .OLD extension from the file name and add the . (https://semidotinfotech.com) NEW extension in its place.

After saving this script to a file, for example rename_extension.sh, make it executable with the following command:

chmod +x rename_extension.sh

And then run the script:

./rename_extension.sh

This will rename all files with a .OLD extension in the current directory to have a .NEW extension instead.

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