With git 2.21.0, tab completion no longer works for subcommands. STEPS TO REPRODUCE 1. install git 2.21.0 from https://git-scm.com/download/mac 2. source /usr/local/etc/bash_completion.d/git-extras (manually, or update your .bashrc/.profile and start a new terminal) 2. git clone https://github.com/tj/git-extras 3. cd git-extras 4. sudo make install 5. change directory to a git repository 6. type "git del” and press [tab] EXPECTED line is changed to "git delete-merged-branches" ACTUAL [beep] CONFIG macOS 10.13.6 (17G5019) and macOS 10.14 (18E226) git 2.21.0 git-extras 4.8.0-dev REGRESSION Works as expected with git 2.17.0. Paul