Since IBM no longer actively distributes the original Primer as a standalone PDF, here is how to get the exact same knowledge legally and reliably:
From reviewing the PDF’s table of contents and community feedback, its strengths include: the mvs jcl primer pdf
Where it falls short (by modern standards): Since IBM no longer actively distributes the original
The Primer provides simple examples of IBM’s utility programs, such as: Where it falls short (by modern standards): The