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What goodies are present in UNIX shells without BASH?

I have been using 'bash' since I used Unix-Linux / Solaris. Now I am interested to know that it is better to use shells such as "ksh", "zsh"? What do geeks do?

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I partially relate to zsh (it's like a mixture of ksh and bash). The guide has a good overview of its features. This page has a nice graph showing the availability of various functions in different shells.

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