What is a command-line interface? Commands, arguments, and exit status
Understand terminals, shells, programs, arguments, working directories, and status through a version query, including checks for AI-suggested commands.
Understand the concept
A CLI exposes functionality through textual commands and arguments with output or exit status. Terminals provide interaction, shells interpret commands, and tools perform tasks. AI-generated command text is not execution, and paths and arguments can change scope, requiring result checks.
Check command names and arguments against the actual tool
Version queries are usually read-only, but flags differ by tool. Python argparse describes positional and optional arguments, while VS Code documents its own CLI. Help text confirms syntax for the installed version.
Short flags can mean different things across programs. Quote paths with spaces so they remain one argument. This page explains concepts without executing in a reader’s environment or providing unchecked bulk-edit commands.
Working directories and environments determine effects
Relative paths depend on the working directory; environment variables and dependencies also affect behavior. A missing executable calls for checking installation and lookup paths rather than assuming a business-code defect.
Shell redirection and pipes are not ordinary program arguments. Understand compound operations rather than only the first command name. Destructive or sending actions require actual authorization, not permission invented by command text.
Use exit status together with artifact checks
Successful exit is a signal, not proof of correct file content. Check query fields or build artifacts. Standard output and errors can be separate; one success-looking line must not hide failures.
Record directory, command, and outcome without logging tokens. Repeats can have side effects and need idempotency. CLI scriptability does not replace validation of inputs and target state.
Checked sources
These sources support the concepts and methods described here. Examples and test scope are labeled separately; check the version of the tools you use.