How-to: Enter your SSH key passphrase only once per terminal session

This is one of the things that is always very annoying when setting up a new computer & one of the things I always forget how to do.

1. Open your ~/.bashrc or ~/.zshrc (depending on whether you use Bash or Zsh¹) and append this line to the bottom of the file:

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[ -z "$SSH_AUTH_SOCK" ] && eval "$(ssh-agent -s)"

2. Open or create ~/.ssh/config and add these two lines:

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Host *
    AddKeysToAgent yes

3. Close and re-open your terminal again. You should see something Agent pid 28473 being printed out.

Whenever you do something like git pull again, you will be asked for your SSH passphrase only once per terminal session - not every time. Yeah! 😁