Duti - macOS Bulk File Association Tool

Duti developed by Andrew Mortensen is a very handy and easy to use tool. Its very useful to set up newly formatted systems. It sets the default Apps for specific extensions.

You can use duti by typing the proper arguments in a shell or the bulk way by reading the arguments from a plain text file or a xml file.

You can download duti's source code here: https://github.com/moretension/duti

Alternatively you can install it with Homebrew

brew install duti

The bulk way, with config file

Any filename will do for this file, duti.conf seems appropriated.

#  BUNDLE ID          UTI/EXT/MIME TYPE      ROLE

#  Text Editor - Sublime 3

com.sublimetext.3             .c             all
com.sublimetext.3             .js            all
com.sublimetext.3             .conf          all
com.sublimetext.3             .cfg           all
com.sublimetext.3             .ini           all
com.sublimetext.3             .json          all
com.sublimetext.3             .jsp           all
com.sublimetext.3             .js            all
com.sublimetext.3             .java          all
com.sublimetext.3             .scss          all
com.sublimetext.3             .css           all
com.sublimetext.3             .sql           all
com.sublimetext.3             .sqlite        all
com.sublimetext.3             .mysql         all
com.sublimetext.3             .txt           all
com.sublimetext.3             .less          all
com.sublimetext.3             .src           all
com.sublimetext.3             .cmd           all
com.sublimetext.3             .hta           all
com.sublimetext.3             .lua           all
com.sublimetext.3             .m             all
com.sublimetext.3             .m4            all
com.sublimetext.3             .h             all
com.sublimetext.3             .php           all
com.sublimetext.3             .pl            all
com.sublimetext.3             .pm            all
com.sublimetext.3             .py            all
com.sublimetext.3             .rb            all
com.sublimetext.3             .vbs           all
com.sublimetext.3             .tlc           all
com.sublimetext.3             .bat           all
com.sublimetext.3             .asm           all
com.sublimetext.3             .cgi           all
com.sublimetext.3             .rss           all
com.sublimetext.3             .xml           all
com.sublimetext.3             .atom          all
com.sublimetext.3             .csv           all
com.sublimetext.3             .bak           all
com.sublimetext.3             .cnf           all
com.sublimetext.3             .log           all
com.sublimetext.3             .asc           all
com.sublimetext.3             .diff          all
com.sublimetext.3             .temp          all
com.sublimetext.3             .tmp           all
com.sublimetext.3             .class         all
com.sublimetext.3             .yml           all

#  Video Player - VLC

org.videolan.vlc              .avi           Viewer
org.videolan.vlc              .mkv           Viewer
org.videolan.vlc              .wmv           Viewer
org.videolan.vlc              .mp4           Viewer
org.videolan.vlc              .m4v           Viewer
org.videolan.vlc              .mpeg          Viewer
org.videolan.vlc              .webm          Viewer
org.videolan.vlc              .mov           Viewer
org.videolan.vlc              .flv           Viewer
org.videolan.vlc              .f4v           Viewer
org.videolan.vlc              .vob           Viewer
org.videolan.vlc              .ogg           Viewer
org.videolan.vlc              .ogv           Viewer
org.videolan.vlc              .gifv          Viewer
org.videolan.vlc              .rm            Viewer
org.videolan.vlc              .asf           Viewer
org.videolan.vlc              .3gp           Viewer
org.videolan.vlc              .avchd         Viewer

# Image Editor - Photoshop

com.adobe.Photoshop           .jpg           all
com.adobe.Photoshop           .jpeg          all
com.adobe.Photoshop           .jpg           all
com.adobe.Photoshop           .bmp           all
com.adobe.Photoshop           .gif           all
com.adobe.Photoshop           .tif           all
com.adobe.Photoshop           .tiff          all

Executing duti

duti duti.conf

That's all! With a single command all these extensions are assigned to a different app. Now we can change file association "the bulk way".

Checking Association

Duti can check what app is associated with some extensions too. For instance to check what app is associated with the md (markdown) extension:

duti -x .md

Output:

MacDown.app
/Applications/Editors/MacDown.app
com.uranusjr.macdown

The -x option is also useful to find apps' bundle ids that will be used in the config file. In the example above the blundle id is com.uranusjr.macdown.