Popular:
 Building Resilient Systems on AWS: Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS.

Find and Change Default App for File Type from Command Line

By  on  

There are few things more frustrating to any computer user than files opening in an unwanted application.  Sure you can use the Open menu item in the desired application but we all just want to double-click a file and see it open in the application we expect.  I recently got to thinking about this dilemma from a command line perspective:  how I could find the default application and then change if I wanted to.

The first step is installing the duti utility with HomeBrew:

brew install duti

With duti equipped you can run the following to see the default app and associated ID which opens a given file extension:

# Check to see what app is meant to halde ".js" files
duti -x js

#Visual Studio Code.app
#/Applications/Visual Studio Code.app
#com.microsoft.VSCode

If you don't know the application ID for a given application you'd like to switch a file type to use, you can get it with the following:

osascript -e 'id of app "Atom.app"'

# com.github.atom

You can change the default app for a given file extension via:

# Use Atom for all ".js" files
duti -s com.github.atom js all

# Open a .js file, watch it open in Atom!
open ~/Projects/debugger.html/src/main.js

There are user interfaces for setting and getting the default app for opening file types but command line provides another type of convenience, if only for the sake of automation.  Knowing how to achieve tasks with simple command line executions can make you a more efficient, agile developer!

Request Metrics real user monitoring
Request Metrics real user monitoring
Request Metrics real user monitoring
Request Metrics real user monitoring

Recent Features

Incredible Demos

  • By
    Assign Anchor IDs Using MooTools 1.2

    One of my favorite uses of the MooTools JavaScript library is the SmoothScroll plugin. I use it on my website, my employer's website, and on many customer websites. The best part about the plugin is that it's so easy to implement. I recently ran...

  • By
    Image Reflections with CSS

    Image reflection is a great way to subtly spice up an image.  The first method of creating these reflections was baking them right into the images themselves.  Within the past few years, we've introduced JavaScript strategies and CANVAS alternatives to achieve image reflections without...

Discussion

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