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duti

duti is a command-line utility capable of setting default applications for various document types on macOS, using Apple's Uniform Type Identifiers (UTI). A UTI is a unique string describing the format of a file's content. For instance, a Microsoft Word document has a UTI of com.microsoft.word.doc. Using duti, the user can change which application acts as the default handler for a given UTI.

Compiling

autoreconf -i
./configure
make
sudo make install

Usage

duti can read settings from four different sources:

  1. standard input

  2. a settings file

  3. an XML property list (plist)

  4. command-line arguments.

A settings line, as read in cases 1 and 2, consists of an application's bundle ID, a UTI, and a string describing what role the application handles for the given UTI. The process is similar when duti processes a plist. If the path given to duti on the command-line is a directory, duti will apply settings from all valid settings files in that directory, excluding files whose names begin with . (single dot).

duti can also print out the default application information for a given extension (-x). This feature is based on public domain source code posted by Keith Alperin on the heliumfoot.com blog.

See the man page for additional usage details.

Examples

  • Set Safari as the default handler for HTML documents:

    duti -s com.apple.Safari public.html all

  • Set TextEdit as the default handler for Word documents:

    echo 'com.apple.TextEdit   com.microsoft.word.doc all' | duti

  • Set Finder as the default handler for ftp:// URLs:

    duti -s com.apple.Finder ftp

  • Get default application information for .jpg files:

    duti -x jpg

# Output
Preview
/Applications/Preview.app
com.apple.Preview

Support

duti is unsupported. You can submit bug reports and feature requests at the duti GitHub project page.

Related

dutis is a wrapper around duti, providing an interactive interface to select default applications.

License

duti was originally released into the public domain by Andrew Mortensen in 2008. It's provided as is without warranties of any kind. You can do anything you want with it. If you incorporate some or all of the code into another project, I'd appreciate credit for the work I've done, but that's all.

Andrew Mortensen April 2018