Technology orientated readers will likely be familiar with the Terminal command line, and may use it on a regular basis. In many leading Linux distributions and on Mac OS X the default Shell is named BASH, or the Bourne Again Shell.
Although excellent for most programming tasks, this isn't the only Shell available and not quite as user-friendly as some alternatives.
It features 24 bit colour with incorrect commands highlighted red by default, auto completions from man(ual) pages and suggestions based on history, syntax highlighting and tab auto completion.
To try it out, install the 'fish' package from your systems package manager, and type 'fish' in your terminal. Use 'exit' to return to your system's default Shell.
Better yet if you're ready to make FISH your permanent default shell, set it in 2 places:
Add the fish shell
> echo /usr/local/bin/fish | sudo tee -a /etc/shells
Change your default shell to fish with:
> chsh -s /usr/local/bin/fish
To change it back, just substitute
/bin/bash as appropriate in the step above.