Implement a robust shell CLI

Q: Implement a robust shell CLI

This question evaluates proficiency in POSIX-compliant shell scripting, including positional argument parsing and validation, ISO 8601 UTC timestamp generation, file metadata extraction for license determination, construction of user@hostname, error handling and exit-code semantics, and handling of non-ASCII file paths.

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Question

Implement a POSIX-compliant shell script invoked as ./script.sh <username> <path_of_file> that outputs a single line formatted as "<timestamp> <license> user@hostname". Requirements: parse and validate both positional arguments; compute an ISO 8601 UTC timestamp; derive the license string from the file (state and document your assumption, e.g., read a 'License:' header or first token); construct user@hostname using the provided username and the local hostname; handle missing file, permission errors, and non-ASCII paths; return meaningful exit codes; and outline basic tests (happy path, bad args, missing file).

Implement a robust shell CLI

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