Debugging Troubleshooting 2025

It covers strict mode flags (set -euo pipefail), custom PS4 prompts that show file and line numbers in traces, trap-based error handlers with stack traces, and profiling techniques for timing slow commands. The examples are copy-paste ready, like rollback-on-failure patterns and debugging why scripts work locally but break in cron. Honestly, the most useful part is the troubleshooting section on platform differences and whitespace issues, since those are the things that eat hours of your day. Good to have bookmarked when set -x alone isn't cutting it.