Variable in condtion such [[ ${v-} = 9 ]]

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Variable in condtion such [[ ${v-} = 9 ]]

From:	Budi
Subject:	Variable in condtion such [[ ${v-} = 9 ]]
Date:	Tue, 29 Aug 2023 00:34:27 +0700

What is variable in condition such

 [[ ${foo-} = bar ]]

as seen in a Linux script of its main package

why is it if just
 [[ $foo = bar ]]

Please give useful info

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Variable in condtion such [[ ${v-} = 9 ]], Budi <=
- Re: Variable in condtion such [[ ${v-} = 9 ]], Emanuele Torre, 2023/08/28
- Re: Variable in condtion such [[ ${v-} = 9 ]], Lawrence Velázquez, 2023/08/28
  - Re: Variable in condtion such [[ ${v-} = 9 ]], Budi, 2023/08/28
- Re: Variable in condtion such [[ ${v-} = 9 ]], Greg Wooledge, 2023/08/28

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