UNIX System Services: How It Works, and How to Fix It When It Doesn't

Project and Program: Core Platform, z/OS Systems Programming

Tags: Proceedings, 2026, SHARE Pittsburgh 2026

UNIX System Services has come a long way since it's early days of providing a POSIX kernel for z/OS. Yet it may still feel like it came from a foreign planet, with hundreds of weirdly named commands like chown, chmod, and vi. This presentation focuses on the essential nuts and bolts of how UNIX works, how to use and exploit the new DSFS, UNION, and PROC file systems, and most important, how to fix it when it is broken.

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