e2image:tldr:fc77d

The command "e2image ${-dev-sdXN} -" is used to create an image of an ext2, ext3, or ext4 file system. Let's break down the command:

• "${-dev-sdXN}" represents a placeholder value for the device block device file to be imaged. The "-dev-sdXN" part indicates a specific block device to be imaged, where "X" represents a specific device identifier (e.g., "a", "b", "c") and "N" represents the partition number. This placeholder should be replaced with the actual block device file you want to create an image of. For example, if you want to create an image of the first partition on the second hard drive, it might look like "/dev/sdb1".

• The "- " (hyphen followed by a space) indicates that the output of the command should be sent to the standard output (typically the console) instead of a file.

In summary, this command takes a block device file as input and creates an image of the specified file system, printing the output to the console.