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.

Available in

  • English

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10 Skills measured

  • REXX Language Fundamentals & Core Syntax
  • Control Structures, Parsing & Built-in Functions
  • TSO/E Command Environment & Output Handling
  • Dataset I/O & Allocation Utilities
  • ISPF Panels, Dialogs & Services
  • Error Handling, Debugging & Diagnostics
  • Batch Automation, JCL & JES/SDSF Interaction
  • Security, System & External Interfaces
  • DB2 & Data Access (DSNREXX), Utility Packaging & Versioning
  • Enterprise Automation, Modernization & Governance

Test Type

Coding Test

Duration

30 mins

Level

Intermediate

Questions

25

Use of 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.

Skills measured

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.

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.

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).

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.

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.

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.

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.

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.

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.

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.

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Recruiter efficiency

6x

Recruiter efficiency

Decrease in time to hire

55%

Decrease in time to hire

Candidate satisfaction

94%

Candidate satisfaction

Subject Matter Expert Test

The REXX Subject Matter Expert

Testlify’s skill tests are designed by experienced SMEs (subject matter experts). We evaluate these experts based on specific metrics such as expertise, capability, and their market reputation. Prior to being published, each skill test is peer-reviewed by other experts and then calibrated based on insights derived from a significant number of test-takers who are well-versed in that skill area. Our inherent feedback systems and built-in algorithms enable our SMEs to refine our tests continually.

Why choose Testlify

Elevate your recruitment process with Testlify, the finest talent assessment tool. With a diverse test library boasting 3000+ tests, and features such as custom questions, typing test, live coding challenges, Google Suite questions, and psychometric tests, finding the perfect candidate is effortless. Enjoy seamless ATS integrations, white-label features, and multilingual support, all in one platform. Simplify candidate skill evaluation and make informed hiring decisions with Testlify.

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Frequently asked questions (FAQs) for REXX Test

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The REXX Test is an assessment designed to evaluate a candidate’s proficiency in REXX, a scripting language widely used in IBM mainframe environments for automation, system interaction, and enterprise-scale utilities.

Employers can use the REXX Test during recruitment to objectively measure a candidate’s ability to write, debug, and integrate REXX scripts, ensuring that only qualified professionals advance in the hiring process.

Systems Engineer Application Support Analyst Automation Engineer System Programmer Integration Engineer

REXX Language Fundamentals & Core Syntax Control Structures, Parsing & Built-in Functions TSO/E Command Environment & Output Handling Dataset I/O & Allocation Utilities ISPF Panels, Dialogs & Services Error Handling, Debugging & Diagnostics Batch Automation, JCL & JES/SDSF Interaction Security, System & External Interfaces DB2 & Data Access (DSNREXX), Utility Packaging & Versioning Enterprise Automation, Modernization & Governance

The test is critical for ensuring organizations hire candidates capable of maintaining, automating, and modernizing mission-critical mainframe systems—reducing operational risk and improving system efficiency.

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