"Murach?s OS/390 and z/OS JCL" teaches JCL statements and coding techniques for all versions of IBM?s OS/390 operating system, including the latest release, called z/OS, that runs on IBM?s new z/900 servers. This book lets you reach a new level of professionalism in a minimum of time. It takes a practical approach to JCL that zeroes in on everyday jobs, so you can learn to code significant job streams in a hurry. It?s filled with syntax and examples, so you have plenty of guides for coding JCL on your own. And all the content is presented in our distinctive paired-pages method that saves you so much training and reference time, you?ll wonder how you ever got along without it. But that?s not all This book is much more than JCL code, though. It gives you an insight into mainframe processing that any programmer or operator will benefit from. You?ll find out about the hardware components that your JCL is controlling. You?ll find out about the operating system operations that affect the efficiency of your jobs. You?ll find out how file-handling facilities, like VSAM, SMS, and HFS, fit into the overall picture. In fact, you?ll get a complete view of the facilities that OS/390 and z/OS offer. The result is, you won?t just learn how to code JCL but you?ll know why you code the parameters the way you do. And as you understand more about your system, you?ll find yourself working at a level of confidence and competence that many experienced mainframers lack.