Exit code 0 indicates everything ran smoothly.

• A. False
• B. Not applicable
• C. True
• D. Unknown

Answer: (C)

In most environments, an exit code is the final status a program returns to its caller. The universal convention is that 0 signals success—the program finished normally without errors—while any non-zero value indicates some problem or error condition. Saying that exit code 0 indicates everything ran smoothly aligns with that convention, because “smoothly” means the run completed as intended with no fatal failures. Some programs may still produce warnings or partial results and still exit with 0 if those conditions aren’t treated as errors; others may use non-zero codes to signal specific failure modes. In automation and scripts, you typically check for a zero exit code to proceed, treating any non-zero code as a signal to stop or handle an error.