True or False: If the onlyif attribute is set, then the exec will only run if the command associated to the onlyif attribute has an exit code of 0.

The statement is true because the onlyif attribute in Puppet is designed to conditionally execute an exec resource based on the success of a specified command. When onlyif is used, Puppet will execute the command provided to onlyif prior to running the main command of the exec resource. If the command returns an exit code of 0, indicating success, only then will Puppet proceed to run the main command. Conversely, if the command exits with any other exit code, the main command will not be executed. This behavior allows for precise control over whether certain actions should take place based on the current environment or state, which is crucial for avoiding unnecessary changes or actions in a Puppet-managed infrastructure.