Limits of SPSS Statistics batch mode for capturing detailed error diagnostics during zero‑downtime migration

Goal: Ensure that all diagnostic information, including error messages, from SPSS Statistics batch mode is captured for verification during a zero‑downtime migration of a small analytical application. Batch mode returns only a process exit code; detailed output must be obtained via the Output Management System (OMS) or by redirecting stdout/stderr. However, OMS commands must appear in the syntax before they can capture output, and certain early‑stage errors may not be intercepted, leaving a gap in visibility.

Can OMS be configured to capture all error messages, including those that occur before any OMS commands are executed in the syntax? Is redirecting stdout/stderr a reliable method to obtain complete error diagnostics from SPSS batch mode on Windows, macOS, and Linux platforms?