This is the core pain point of shell scripting: silent errors, cryptic edge cases, and fragile code that grows harder to maintain with every patch. Shell scripts seem simple at first—just a few commands strung together—but complexity creeps in fast. Tiny changes in environments break them. Input parsing turns into a hazard zone. Error handling is inconsistent because the shell itself isn’t strict.
One of the biggest shell scripting pain points is debugging. Output is mixed across stdout and stderr with no standardized structure. Logs are minimal unless you wire them yourself. Tracing the root cause of a failure often means rerunning in debug mode with set -x, which still gives an incomplete picture. Another is portability. Bash on one system may not behave like Bash on another. POSIX compatibility often means removing modern conveniences, making scripts both harder to write and easier to misread.
Security is another hidden trap. Unquoted variables and unsafe expansions can open doors to injection attacks. Simple mistakes—forgetting to wrap $var in quotes—can destroy data or expose a system. Input sanitization is manual and repetitive.