What are some alternatives?
When comparing GNU Bourne Again SHell and fshell, you can also consider the following products
fish - The friendly interactive shell.
DASH - DASH is a secure, blockchain-based global financial network which offers private transactions.
zsh - The Z shell (Zsh) is a Unix shell that can be used as an interactive login shell and as a powerful command interpreter for shell scripting.
Xiki - Xiki makes the command line friendlier and more powerful.
rc - a shell - This is a reimplementation for Unix, by Byron Rakitzis, of the Plan 9 shell.
win-bash - win-bash is a Windows port of the famous GNU bash (see GNU Bash homepage).