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unsetting non set items

From: 積丹尼 Dan Jacobson
Subject: unsetting non set items
Date: Thu, 19 Dec 2019 23:35:56 +0800 
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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