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• name - name used to refer to the group. This string must be unique.
• requires - comma-separated list of dependencies for the group. These can be group or step names.
• unless - If the string evaluates to a non-null value, the group is not executed.
• if - If the string evaluates to a null value, the group is not executed.

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• name - name used to refer to the step. This string must be unique.
• requires - comma-separated list of dependencies for the step. These can be group or step names.
• unless - If the string evaluates to a non-null value, the step is not executed.
• if - If the string evaluates to a null value, the step is not executed.
• delay - the step pauses this number of seconds before execution of the command starts.
• exec - the command to execute for this step.
• env - if this string contains an exclamation point ("!") the step fails if the execution of the command does not return an error.

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