PARMLIB
**PARMLIB**
What is PARMLIB?
PARMLIB (Parameter Library) is a set of partitioned datasets in z/OS (mainframe operating system) that contain control statements used during system initialization and operation. These control statements configure various aspects of the system, such as defining datasets, specifying system options, and controlling the execution of system tasks. PARMLIB members are read by various z/OS components during IPL (Initial Program Load) and subsequent operations to customize the system environment. Examples of PARMLIB members include IEASYSxx (system parameters), IEAIPSxx (installation performance specifications), and IEAICSxx (installation control specifications).
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