bash: Variable substitution - If variable is unset, set variable to word.
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Take into account the main readme for this section. README first.
Syntax is:
${name=word}if the variable $name is unset, then set variable to word.
Here Brazil is set, has a value of SugarCane, hence no Brazil stays as SugarCane.
$ Brazil=SugarCane $ Amazon=${Brazil=NoDeforestation} $ echo $Amazon SugarCane
Now change Brazil to Brazil1 and try again.
$ Amazon=${Brazil1=NoDeforestation} $ echo $Amazon NoDeforestation $ echo $Brazil1 NoDeforestation
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