Coding.
REXX Test
The REXX Test evaluates mainframe scripting expertise, ensuring organizations hire candidates skilled in automation, data handling, and system integration for efficient, reliable operations.
Summarize this test and see how it helps assess top talent with:
- Test type
- Coding
- Duration
- 30 min
- Level
- Intermediate
- Questions
- 25
Skills measured
REXX Language Fundamentals & Core Syntax
Covers foundational elements of REXX including its role in mainframe automation, variable usage (numeric, string, compound variables, STEMs), operators, expressions, and simple I/O (SAY, PULL, ARG). Tests ability to recognize syntax rules, execution contexts (interactive vs. batch), and write basic scripts.
Control Structures, Parsing & Built-in Functions
Examines ability to construct logic using IF/ELSE, SELECT/WHEN/OTHERWISE, and DO loops (WHILE, UNTIL). Tests skill with parsing techniques (PARSE PULL, PARSE VAR, PARSE ARG, templates) and manipulation functions (SUBSTR, POS, STRIP, WORD, TRANSLATE). Focuses on string-driven data handling critical in z/OS utilities.
TSO/E Command Environment & Output Handling
Assesses how REXX integrates with the TSO/E command environment. Includes ADDRESS environments (TSO, ISPEXEC, ISREDIT, MVS), executing system commands, using OUTTRAP for capturing command output, checking return codes (RC, RESULT), and leveraging dataset inquiry functions (SYSDSN, LISTDSI).
Dataset I/O & Allocation Utilities
Focuses on dataset access using EXECIO (DISKR, DISKW), allocating/freedom of datasets (ALLOCATE, FREE), managing DDNAMEs, handling PDS/PDSE members, understanding dataset attributes (DSORG, RECFM, LRECL). Evaluates error handling in dataset operations and resilience in I/O routines.
ISPF Panels, Dialogs & Services
Evaluates ability to design ISPF panels and dialogs with Z-variables, manage dialog flow, use ISPF services (DISPLAY PANEL, ADDPOP, message services), and table services (TBOPEN, TBGET, TBMOD). Includes library management services (LMINIT, LMOPEN, LMGET, LMFREE) and skeleton integration for automation.
Error Handling, Debugging & Diagnostics
Tests structured error and diagnostic practices using TRACE modes, condition handling (SIGNAL ON ERROR/FAILURE/NOVALUE/SYNTAX), logging, RC interpretation, and defensive coding techniques. Includes scope management with EXPOSE and strategies for debugging multi-module REXX applications.
Batch Automation, JCL & JES/SDSF Interaction
Assesses running REXX in batch (IRXJCL), job submission via internal reader, JES2/3 interaction, and SDSF REXX services (ISFEXEC, stem data handling). Focuses on spool parsing, detecting condition codes, monitoring job status, and creating resilient automation scripts for operations.
Security, System & External Interfaces
Explores integration with RACF for security checks, authority validation, and audit automation. Includes issuing operator commands, using MVS environment commands, leveraging UNIX System Services (USS) callable services, and SAF-based dataset access validations. Emphasizes secure coding in enterprise environments.
DB2 & Data Access (DSNREXX), Utility Packaging & Versioning
Focuses on using DSNREXX for DB2 access: connecting, preparing statements, executing, fetching, handling SQLCA, cursors, and transactions (COMMIT, ROLLBACK). Also includes best practices in utility packaging, creating reusable modules, version control practices (SCLM, Git), and integration with test frameworks.
Enterprise Automation, Modernization & Governance
Encompasses high-end capabilities: designing enterprise-scale REXX automation frameworks, optimizing performance (I/O reduction, parse efficiency), compiled REXX/REXX/370, z/OSMF workflows, MQ/DB2 subsystem orchestration, REST/HTTP integration via USS, and COBOL/CLIST interoperability. Includes governance practices such as code review processes, compliance frameworks, and audit readiness.
Use of the REXX Test
The REXX (Restructured Extended Executor) Test is designed to evaluate a candidate’s proficiency in one of the most widely used scripting languages for IBM mainframe environments. REXX plays a critical role in automating processes, streamlining system interactions, and supporting enterprise-scale applications. As organizations continue to rely on mainframe systems for mission-critical workloads, the ability to effectively script, troubleshoot, and integrate REXX solutions remains a vital skill set.
This assessment provides a rigorous and structured evaluation of both foundational knowledge and advanced application of REXX. It measures a candidate’s ability to write and debug scripts, manipulate data, interface with mainframe subsystems, and design automation solutions. Beyond technical fluency, the test also examines problem-solving capabilities and adaptability in real-world scenarios, ensuring that candidates can contribute effectively to complex IT landscapes.
Hiring managers and technical leaders benefit from this test by gaining clear insights into a candidate’s readiness to handle practical mainframe challenges. It helps organizations identify professionals who can maintain legacy systems while also enabling modernization initiatives. By ensuring that candidates possess the necessary skills in areas such as control structures, dataset handling, system integration, and enterprise automation, this test supports better decision-making in recruitment and team building.
In summary, the REXX Test is an essential tool for validating expertise, ensuring quality hires, and safeguarding the efficiency of mainframe operations in today’s technology-driven enterprises.
Who is this test for?
Our REXX Test is relevant across industries like banking, insurance, and IT services, assessing candidates for roles in mainframe development, system administration, and automation—ensuring they possess the skills to maintain, optimize, and modernize mission-critical systems.
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View reportTop five hard skills interview questions for REXX
Here are the top five hard-skill interview questions tailored specifically for REXX. These questions are designed to assess candidates’ expertise and suitability for the role, along with skill assessments.
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