e2freefrag:tldr:c5957
e2freefrag: Check how many free blocks are present as contiguous and aligned free space.
$ e2freefrag ${-dev-sdXN}
try on your machine
The command e2freefrag ${-dev-sdXN} is not a valid command syntax.
However, assuming it was supposed to be a curly braces syntax like e2freefrag ${dev-sdXN}, it is likely trying to use the value of the variable dev-sdXN as an argument for the e2freefrag command.
In this case, the value of dev-sdXN should represent the device name or path of a disk partition, such as '/dev/sda1'. The e2freefrag command is used to display the fragmentation information of an ext2/ext3/ext4 filesystem on the given device.
By substituting the variable value into the command, it would look like e2freefrag /dev/sdXN. This command would analyze the fragmentation level of the specified filesystem on the given device.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.