$ help unset
unset: unset [-f] [-v] [name ...]
For each NAME, remove the corresponding variable or function. Given
the `-v', unset will only act on variables. Given the `-f' flag,
unset will only act on functions. With neither flag, unset first
tries to unset a variable, and if that fails, then tries to unset a
function. Some variables cannot be unset; also see readonly.
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