I use zsh on my Mac terminal and in general I prefer it to bash but it has an annoying default setting whereby when you try to repeat a command via substituted history expansion it asks you to verify that.

For example let’s say by mistake I try to vi into a directory rather than cd’ing into it:

If I try to cd into the directory by using '!$' to grab the last argument from the previous command it will make me confirm that I want to do this:

While reading another one of Peter Krumins' blog posts, this time about bash command line history, I came to learn that this is because a setting called http://wiki.bash-hackers.org/internals/shell_options#histverify has been enabled.

I found a thread on StackOverflow which explains all the zsh settings in more detail but for my purposes I needed to run the following command to disable histverify:

I also put that into my ~/.zshrc file so it will carry across to any new terminal sessions that I open.