mkfs.btrfs:tldr:b33fd

This command is used to create a Btrfs (B-tree file system) on a specific device. Let's break it down:

• sudo: It runs the command with administrative privileges. This may require entering your password.
• mkfs.btrfs: It is the command to create a Btrfs file system.
• --metadata single: This flag specifies that the metadata of the file system should be stored with a single copy. In Btrfs, metadata refers to the system's structural information.
• --data single: This flag specifies that the data should be stored with a single copy. Data refers to the actual content and files stored in the file system.
• ${-dev-sda}: This is the path to the device, in this case, it is assuming the device is /dev/sda. The dollar sign and curly brackets are used to reference the value of the variable, but it seems like there is a typo with the dash. It should be /dev/sda instead of ${-dev-sda}.

By using this command, you will create a Btrfs file system on the specified device (/dev/sda in this case) with both metadata and data stored with a single copy.