Exit code
An exit code is a numeric status returned by a process when it terminates to indicate the outcome of its execution.
Tiny Python Projects: Learn coding and testing with puzzles and games
An error code is a numeric process exit status indicating that a program terminated because an error occurred.
- How it is used
- Coordinates command-line error reporting, validation, testing, shell redirection, and pipeline control.
- How deep it goes
- Explains zero versus nonzero statuses, sys.exit() forms, STDERR routing, validation branches, and status assertions, but not operating-system status internals.
- Examples
- Demonstrates invalid arguments, missing placeholders, STDERR redirection, explicit sys.exit(1), string-based sys.exit(), and nonzero-status tests.
- What you can do after
- Apply it via Python's sys.exit() and argparse to report failures, separate diagnostics, stop pipelines, and test error behavior.
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Kubernetes in Action, Second Edition
An exit code is a numeric result returned by a process when it terminates, conventionally indicating success or failure.
- How it is used
- Uses process results to evaluate container health and interpret container termination during Kubernetes lifecycle operations.
- How deep it goes
- Explains zero, non-zero, 128+n, 137, and 143 codes, then applies them to probes, restarts, signals, and logs.
- Examples
- Demonstrates exit code 0 after graceful termination, code 137 after killing, and command results from an exec liveness probe.
- What you can do after
- Diagnose/debug with it by inspecting pod status, interpreting termination codes, and retrieving logs from the previous container.
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Related concepts
- sys.exitproduced by · sys.exit is a Python function that terminates program execution by raising a SystemExit exception with an optional exit status or message.
- testproduced by · A test is a procedure or check that evaluates behavior using specified inputs or evidence against expected results or criteria.
- parser.error()produced by · parser.error() is an argparse parser method that reports a command-line parsing error, displays usage information, and terminates the program with a failure status.
- statusproduces · A status is a field, section, value, or indicator that records the current condition, state, or outcome of a resource, entity, or operation.
- workflowmeasures · A workflow is an organized sequence of coordinated activities, tasks, or decisions through which work progresses toward an outcome.
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