Renaming a file to include date

To rename a file to include the date in the filename use the following:

mv myfile.txt myfile_$(date + %d-$m-%Y).txt

This can be useful when creating backup files.

A script called by cron like the below might be useful.

#!/bin/bash
rm myfile_*.tar
tar -cf myfile.tar myfile.txt && mv myfile.tar myfile_$(date + %d-$m-%Y).tar