If you’re interested, start the series with part 1.
If you’re on linux, you’re in luck. You’ve already got the latest bash
for your release on your system. If you aren’t using it already, you
just need to change your default shell to bash: run
chsh -s /bin/bash.
If you’re on macos, it’s a bit more involved. The system bash is an unconscionably old version, and the newest macos releases default to zsh. You’ll need homebrew installed first to install the latest bash. Open a terminal and follow the directions on the homebrew site.
Once homebrew is installed, install bash with
brew install bash.
Then, make bash your default shell. First you’ll need to add it to
sudo -e /etc/shells. Add the following line to
the end of the file and save:
chsh -s /usr/local/bin/bash. Every new terminal window will
use the latest bash. Close your existing window, open a new one and run
echo $BASH_VERSION to see what version you are on now. It should be a
version of bash 5.