bash: Variable substitution - Use variable name if set otherwise use word.

indigowinged

Take into account the main readme for this section. README first.

Syntax is:
${name-word}

if the $name variable is set, then substitute its value, otherwise use word

Here Brazil is set, has a value of SugarCane

$ Brazil=SugarCane
$ Amazon=${Brazil-NoDeforestation}
$ echo $Amazon
SugarCane

Lets's change Brazil variable to Brazil1 and try again. Brazil1 is not set.

$ Amazon=${Brazil1-NoDeforestation}
$ echo $Amazon
NoDeforestation