What are some alternatives?
When comparing fish and zsh, you can also consider the following products
DASH - DASH is a secure, blockchain-based global financial network which offers private transactions.
GNU Bourne Again SHell - Bash is the shell, or command language interpreter, that will appear in the GNU operating system.
Bash - A simple and fast way to hangout with friends
Xiki - Xiki makes the command line friendlier and more powerful.
fshell - fshell is the Symbian equivalent of bash + telnet + a posix-like set of command-line tools.
Oh My Zsh - A delightful community-driven framework for managing your zsh configuration.