duti: add page (#2287)

pages/osx/duti.md

@@ -0,0 +1,27 @@
+# duti
+
+> Set default applications for document types and URL schemes on macOS.
+
+- Set Safari as the default handler for HTML documents:
+
+`duti -s {{com.apple.Safari}} {{public.html}} all`
+
+- Set VLC as the default viewer for files with .m4v extensions:
+
+`duti -s {{org.videolan.vlc}} {{m4v}} viewer`
+
+- Set Finder as the default handler for the ftp:// URL scheme:
+
+`duti -s {{com.apple.Finder}} {{ftp}}`
+
+- Display information about the default application for a given extension:
+
+`duti -x {{ext}}`
+
+- Display the default handler for a given UTI:
+
+`duti -d {{uti}}`
+
+- Display all handlers of a given UTI:
+
+`duti -l {{uti}}`