File Extension Change Shortcut

By  on  

Changing the extension of a file seems like something you would do often enough to know how to do it from command line.  One annoying part of moving a file is repeating the file name a second time when all I want to do is change the extension.  A minor annoyance but an annoyance nonetheless.

I recently found that you can quickly change a file's extension with this handy shortcut:

# mv filename.{old,new}
mv code.{txt,js}

The braced syntax provides a way to quickly swap out the file extension without needing to repeat the file name.  Sweet!

Recent Features

  • By
    Serving Fonts from CDN

    For maximum performance, we all know we must put our assets on CDN (another domain).  Along with those assets are custom web fonts.  Unfortunately custom web fonts via CDN (or any cross-domain font request) don't work in Firefox or Internet Explorer (correctly so, by spec) though...

  • By
    Chris Coyier’s Favorite CodePen Demos

    David asked me if I'd be up for a guest post picking out some of my favorite Pens from CodePen. A daunting task! There are so many! I managed to pick a few though that have blown me away over the past few months. If you...

Incredible Demos

  • By
    Animated AJAX Record Deletion Using jQuery

    I'm a huge fan of WordPress' method of individual article deletion. You click the delete link, the menu item animates red, and the item disappears. Here's how to achieve that functionality with jQuery JavaScript. The PHP - Content & Header The following snippet goes at the...

  • By
    Build a Slick and Simple MooTools Accordion

    Last week I covered a smooth, subtle MooTools effect called Kwicks. Another great MooTools creation is the Accordion, which acts like...wait for it...an accordion! Now I've never been a huge Weird Al fan so this is as close to playing an accordion as...

Discussion

  1. This does not only work for file extensions. You can generally use the curly braces syntax to “generate” multiple words/arguments for a bash command: http://www.gnu.org/software/bash/manual/bashref.html#Brace-Expansion

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!