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Aug 15th, 2020
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  1. >>> set -o nounset
  2. >>> echo $KK
  3. zsh: KK: parameter not set
  4. >>> [ ! -z "${KKK:-}" -a $KK ]
  5. zsh: KK: parameter not set
  6. >>> [ ! -z "${KKK:-}" ] && echo $KK
  7.  
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