Conditional statements

Puppet has the conditional statements you would expect of any language, with if, unless, and case allowing code behavior to be different depending on things such as facts or data from external sources. Puppet additionally uses selectors, which are similar to a case statement but return a value instead of executing code on result.

If and unless statements

The if statement follows a specific syntax that includes the if keyword followed by a condition, an opening curly brace ({), the Puppet code to execute if the condition evaluates to true, and a closing curly brace (}).

The following example is a simple check on a Boolean in example_bool to print a notice if it contains true:

if $example_bool {
  notice 'It was true'
}

This can be optionally extended by adding an else keyword after the closing curly brace (}) of the if statement and then using an opening curly brace ({) with Puppet code to perform if the condition is false. This...