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sh: Bourne shell, the original and perhaps the simplest Unix shell.
csh: C shell, with a syntax modeled after the C programming language.
tcsh: a superset of the C shell.
ksh: Korn shell, compatible with the Bourne shell, it includes many features of the C shell as well.
bash: Bourne Again shell, largely backward-compatible with sh, it includes ideas drawn from ksh and csh.