Delete local branches that do not exist remotely.
$ git fetch --all --prune; git branch --verbose | grep ": gone]" | awk '{ print $1 }' | xargs --no-tags 1 git branch --delete --force
NOTE (2022-07-09): Xcode finally added this functionality in Xcode 14, please see release notes here:
New Features in Xcode 14 Beta 3
When editing code, the Edit > Duplicate menu item and its corresponding keyboard shortcut now duplicate the selected text — or the line that currently contains the insertion point, if no text is selected. (8614499) (FB5618491)