To delete a directory and all of its contents, including subdirectories and files, on a Unix or Linux system, you can use the rm command with the -r option.
For example, to delete the directory /tmp/mydir and all of its contents, you can use the following command:
rm -r /tmp/mydir
This will delete the directory /tmp/mydir and all of its contents, including subdirectories and files.
It is important to note that the rm command is a powerful utility that can delete files and directories permanently, and it does not have an "undo" option. Therefore, it is important to use the rm command carefully and make sure that you do not accidentally delete important files or directories.
The rm command also has several options that allow you to customize the behavior of the command. For example, you can use the -f option to force the delete operation, or the -i option to prompt for confirmation before deleting each file or directory.
For more information about the rm command and its options, you can consult the documentation for your specific Unix or Linux system.