The 'learn bash, it's available everywhere' really bit me when I moved from being a Linux Sysadmin to an AIX Sysadmin. Only ksh is available in this case. It took quite a few months to get used to.
Tell me about it. I've always worked with Linux, so was used to bash and its conveniences. Then I got a job where they use ancient Solaris systems with csh. Luckily, tcsh is generally installed which at least supports command line completion (after having to start it manually), otherwise I'd go mad.
Same thing happened to me a few years ago with Solaris and Irix. I used to use bash but the best shell available at work was tcsh. Now I have so much invested in tcsh that it is difficult to change back.
