LISTCAT

LISTCAT is a command-line utility commonly found on IBM mainframe operating systems, particularly those running z/OS. Its primary function is to list cataloged datasets and their associated information. The command provides a way for users to query the system's catalog to locate files, retrieve their attributes, and understand their physical storage characteristics.

When executed, LISTCAT typically displays details such as the dataset name, its creation and expiration dates, record format, record length, block size, and the volumes on which the dataset resides. It can also show the type of dataset (e.g., sequential, partitioned, or VSAM) and its organization. Users can employ various parameters with LISTCAT to filter the results, specifying criteria like dataset name patterns, creation dates, or storage locations. This allows for targeted searches within the vast number of datasets managed by the mainframe system.

LISTCAT is an essential tool for system administrators, application developers, and operators who need to manage, monitor, and troubleshoot dataset storage. It aids in tasks such as verifying dataset existence, understanding storage allocation, and identifying potential issues like full volumes or expired datasets that may be eligible for deletion. The command's output is often used as input for other JCL (Job Control Language) or scripting operations.