[Bug 217397] builtin csh() unset doesn't work

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217397

--- Comment #2 from mr.xanto at gmail.com ---
(In reply to rb from comment #1)

What difference between "variable" (unset) and "environment variables"
(unsetenv)?
What variables can be operated by "unset" command?

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