tune2fs:tldr:8f8c7

The command tune2fs -o^${nobarrier} ${-dev-sdXN} is used to modify the options of an ext2/ext3/ext4 file system on a specified block device (in this case, /dev/sdXN).

Here is the breakdown of the command:

• tune2fs: It is the command-line tool used to adjust various parameters and options of an ext2/ext3/ext4 file system.
• -o: This option is used to specify that we want to change the filesystem options.
• ^${nobarrier}: This part is used to remove the nobarrier option from the filesystem options. The ${nobarrier} is likely a shell variable that contains the nobarrier option.
• ${-dev-sdXN}: This is where the block device is specified. -dev-sdXN is likely a placeholder for the actual block device path, such as /dev/sda1.

So, essentially, the command is removing the nobarrier option from the specified file system's options on the given block device.