What are some alternatives?
When comparing sash and KornShell, you can also consider the following products
GNU Bourne Again SHell - Bash is the shell, or command language interpreter, that will appear in the GNU operating system.
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.
fshell - fshell is the Symbian equivalent of bash + telnet + a posix-like set of command-line tools.