How are shell variables assigned?

How are shell variables assigned?

The shells from the C shell category use "set variable=value" for
variables local to the shell and "setenv variable value" for
environment variables. To get rid of variables in these shells
use unset and unsetenv. The shells from the Bourne shell
category use "variable=value" and may require an "export
VARIABLE_NAME" to place the variable into the environment. To
get rid of the variables use unset.


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