udisksctl:tldr:7fe41

The command "udisksctl unmount --block-device ${-dev-sdXN}" is used to unmount a block device in Linux.

Here's a breakdown of each component:

• "udisksctl" is the command-line tool used to interact with udisks, which is a service that handles mounting and unmounting of disk devices.
• "unmount" is the action parameter, specifying that we want to unmount the block device.
• "--block-device" is an option that indicates that we want to specify the block device to unmount.
• "${-dev-sdXN}" is a placeholder for the actual block device path. In this case, "-dev-sdXN" should be replaced with the specific block device you want to unmount. The X represents the device letter (e.g., a,b,c), and N represents the partition number (e.g., 1,2,3) of the device.

For example, if you want to unmount the first partition of a device located at /dev/sdb, you would substitute "${-dev-sdXN}" with "/dev/sdb1", resulting in the command "udisksctl unmount --block-device /dev/sdb1".