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Create a command-line tool /app/backup.py with two subcommands: checksum and verify .

Create a command-line tool /app/backup.py with two subcommands: checksum and verify .: a task in TermGrade Environments: 1,004 executable Linux tasks (Harbor dataset). checksum subcommand: - Takes one required argument: a directory path. - Recursively finds all regular files in that directory…

The task

**`checksum` subcommand:** - Takes one required argument: a directory path. - Recursively finds all regular files in that directory (excluding symlinks, sockets, FIFOs, etc.). - For each file, computes a SHA-256 checksum. - Writes a manifest to stdout. The manifest format is: each line is `SHA256_HEX FILENAME` where…

Part of ai-and/termgrade-environments.