e2image:tldr:54530

The command "e2image -Q ${-dev-sdXN} ${path-to-image_file}" is used to create a compressed file system image of a specific partition on a block device.

Here is the breakdown of the command:

• "e2image" is the command used to create an image of an ext2, ext3, or ext4 file system.
• "-Q" is an option that tells the command to compress the image while creating it. This makes the resulting image file smaller in size.
• "${-dev-sdXN}" is a placeholder that needs to be replaced with the actual block device path and partition number. For example, if you want to create an image of the second partition on the /dev/sdb disk, the placeholder would be replaced with "/dev/sdb2".
• "${path-to-image_file}" is also a placeholder that should be replaced with the desired path and filename for the resulting image file. For example, if you want to save the image file as "myimage.img" in the current directory, the placeholder would be replaced with "myimage.img".

Overall, this command can be used to create a compressed image file of a partition on a block device for backup or transfer purposes.