hadolint:tldr:d92c3

The command hadolint is a tool used to evaluate Dockerfiles for best practices and possible errors. It scans the Dockerfile and provides warnings or suggestions for improving its quality.

The specific command hadolint --format ${json} ${path-to-Dockerfile} executes the hadolint tool with additional options specified. Here is the breakdown:

• hadolint: Refers to the hadolint command, indicating that you want to run this tool.
• --format ${json}: Specifies the output format of the tool as JSON. The ${json} here isn't a command or literal value; it represents a variable or placeholder that could be replaced with the actual output format, e.g., --format json. This flag instructs hadolint to display the results in JSON format.
• ${path-to-Dockerfile}: Refers to the path of the Dockerfile that you want to evaluate using hadolint. You would replace ${path-to-Dockerfile} with the actual file path, such as /path/to/my/Dockerfile.

Overall, this command runs hadolint with the specified options and provides feedback on the quality and best practices of the specified Dockerfile in JSON format.