MAINFRAME AUTOMATION WITH REXX: TSO/ISPF SCRIPTING FOR IBM Z/OS SUBTITLE: Reduce Manual Work with REXX Automation. JCL Processing, System Administration, and Operational Efficiency for z/OS Paperback – October 29, 2025

Automate real z OS work with REXX to cut manual steps, stabilize operations, and deliver predictable results in TSO ISPF and batch.Manual edits, fragile JCL tweaks, and ad hoc console actions slow teams and add risk. On a busy LPAR, small inconsistencies in SYSEXEC search paths, dataset attributes, or RACF permissions turn simple tasks into late night incidents.This guide shows a disciplined path. You will place execs where z OS expects them, call host services that do real work, and return clear outcomes that operators can act on. Every topic is grounded in practical REXX patterns that work in foreground and batch.Set reliable execution paths with SYSEXEC or SYSPROC and use ALTLIB for safe session scoped testingDrive host environments that matter, ADDRESS TSO for allocations and submissions, ISPEXEC and ISREDIT for dialogs and edit macros, SDSF APIs for job controlBuild useful dialogs, ISPF panels, messages, help, and file tailoring with FTOPEN FTINCL FTCLOSE to emit clean JCL and configsScale edits and library work, LMINIT LMOPEN LMMLIST and table services, macros with CONFIRM SAVE END, and programmatic compare and search with ISRSUPCAllocate datasets that do not fail, apply sound DCB hygiene for FB and VB, understand PDS versus PDSE behavior and statisticsDiscover datasets correctly with LISTDSI and MVSVAR, avoid scraping human text from LISTDSSet up and maintain GDGs, control retention, and produce cleanup jobs and reports you can auditAutomate JCL with ISPF skeletons, parameterize templates, manage PROCs, overrides, conditional JCL, and INCLUDE workflowsSubmit and hold with intent, add audit lines and correlation ids, and operate jobs at scale with SDSF cancel purge requeue and safe retriesRespect security, pass RACF checks for JESJOBS JESSPOOL SURROGAT, run SDSF under SAF with read only first, and record who did what and when with USER on JOB cardsUse safe console paths with ISFSLASH, capture replies, and keep a fallback console for controlled recoveryIntegrate z OS UNIX, run BPXBATCH and OSHELL, move data with OCOPY OPUT OGET without corrupting code pagesCapture stdout and stderr reliably, define return code contracts, and enforce time limits that halt cleanlyTest and harden automation, write self diagnosing execs, structure logs and return code maps, use timeouts retries with backoff, and design for idempotencePackage and ship, store tools in PDSE libraries with version tags and statistics for searchability, then promote and roll back with controlled distributionApply proven playbooks, a submit and wait shepherd with SDSF polling and hard timeouts, library inventory and drift checks, RACF bulk changes with dry run and audit trail, and emergency stop or start procedures with reply captureThis is a code heavy guide. REXX, JCL, SDSF, and ISPF examples are written to run as working building blocks for real projects.Get a dependable mainframe automation toolkit, start reducing manual work today. Read more