Is it worthwhile acquiring/learning the bash shell over korn?

I switched to bash a few years ago (from zsh) and have never looked back.

I’ve found very few systems that don’t have bash on them, and so see it as a very standard was to ensure that your shell scripts are pretty universally usable.

I’ve switched from tcsh to bash several years (and then actually on to zsh; I wonder why sferik switched from zsh to bash). I especially find the scripting much more clearer. Also, I believe there’s less difference between ksh and bash than between (t)csh and bash, so you should be relatively safe from drastic changes.
I will certainly ensure bash is around (or zsh otherwise), especially for my scripts.

I exclusively use bash. You’ll find that most unix or linux based machines will be running bash (I’d say near 80% or more). Almost no one uses korn. Zsh isn’t bad but I always use bash.

Some systems will let you switch back and forth between shells. For example, while I was in school I wrote programs though ssh on a main server. There was some obscure shell that I couldn’t navigate as quickly as bash so I just put a command in my .profile to start bash every time I log on. Problem solved.

edit: Crap I just saw that this is from 2007. You probably don’t care anymore.