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This is a Todo tool implemented in Shell, and below is its usage instructions:

Usage

todo [options] [arguments]

Options

• -a or --add: Add a task to the todo list.
• -d or --done: Mark a task as completed.
• -u or --undo: Undo a completed task.
• -D or --del or --delete: Delete a task.
• -r or --recycle: Clear completed tasks.
• -s or --sort: Sort tasks by task number.
• -l or --list or empty option: Display the task list.
• -h or --help: Display help information.

Arguments

• add: The content of the task to be added.
• done: The task number to mark as completed.
• undo: The task number to undo completion.
• delete: The task number to delete.
• lineNum: Starting line number for operations.
• toLineNum: Ending line number for operations.

Examples

• Add a task:

todo -a "Buy groceries"

• Mark a task as completed:

todo -d 1

• Undo a completed task:

todo -u 1

• Delete a task:

todo -D 1

• Clear completed tasks:

todo -r

• Sort the task list:

todo -s

• Display the task list:

todo -l

• Display help information:

todo -h

Note: If no option is provided, the arguments will be treated as the content of a task to be added to the list.

# The following two commands have the same effect
todo Buy groceries 
todo -a Buy groceries

You can choose appropriate options and arguments to manage your task list according to your needs.