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Languages & runtimes · #rexx
The Rexx SHELL function returns a command's exit status while the text output lands in SHELLOUTPUT. Treat them as two separate results, validate input, and watch platform quoting.
Learn how Rexx’s PARSE instruction can tokenize input in a single readable statement, with a worked example, verification steps, and notes on limitations.
Learn how the PARSE instruction simplifies tokenizing strings in Rexx scripts, improves readability, and works across implementations, with a worked example and notes on limitations.
Learn how Rexx’s PARSE instruction can turn a raw Apache log line into clearly named variables without writing loops or regular expressions.
When automating system tasks with REXX, the CALL statement can run any OS command. This article outlines a minimal, secure design: whitelist enforcement, output capture, status checks, and cleanup. It also covers failure modes and when to adjust the design for high‑throughput or cross‑platform use.
Stop fighting with inconsistent regex engines. Learn how Rexx's PARSE instruction uses simple templates to extract text fields consistently across Linux, Windows, and mainframes.
Learn how Rexx’s built‑in list type gives O(1) key lookup, simplifies iteration, and where to watch for memory or compatibility issues.
A diagnostic guide for resolving Syntax Errors and Undefined Variable issues in Rexx, featuring a diagnostic matrix, tracing techniques, and initialization fixes.
Rexx’s built‑in REGEXP function lets you perform POSIX‑style pattern matching without external libraries. Learn how to extract substrings, pre‑compile patterns for speed, and avoid common pitfalls like backtracking and legacy support gaps.