Can shells be classified into categories?
In general there are two main class of shells. The first classare those shells derived from the Bourne shell which includes sh,
ksh, bash, and zsh. The second class are those shells derived
from C shell and include csh and tcsh. In addition there is rc
which most people consider to be in a "class by itself" although
some people might argue that rc belongs in the Bourne shell class.
With the classification above, using care, it is possible to
write scripts that will work for all the shells from the Bourne
shell category, and write other scripts that will work for all of
the shells from the C shell category.
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