How can i configure
tcsh to show available choices by pressing Tab twice, just like bash?
If you look in the
tcsh/csh man page you'll find a option under "completion":
Add this to your
.cshrc file to enable this feature.
A word on tcsh/csh
This shell really shouldn't be used, both are sub-par shells by today's standards and are wrought with poorly implemented features. You should be using Bash, Zsh, Ksh, or something else entirely.