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unsetting non set items

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  unsetting non set items 積丹尼 Dan Jacobson <jidanni@jidanni.org> - 2019-12-19 23:35 +0800

#15755 — unsetting non set items

Man bash: "unset"
  if there is no variable by that name, any function with that name is unset.
Add:
  If there is no function by that name, nothing happens for that name.

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