Rename file extension of multiple files at once

Sometimes, you might need to rename the file extension of multiple files and this can be simply accomplished from command line without the use of any tools.

In the command prompt, move to the proper directory containing the files whose extension is to be renamed. Then type as following in the command prompt.

ren *.jpg *.exe

The above command will rename all the jpg files in that folder to exe. Similar command rename exists in the linux to achieve the same effect. Hope this comes to be handy for you.