The administrator notices that a 10GB ext2 file-system used only for data storage has approximately 540MB reserved for root. Which command can be used to change the file-system parameters to make all of the partition available to users, WITHOUT losing data? Please enter only the command without path, options or parameters.

Answer: tune2fs

Explanation:
When we creates the ext2/ext3 filesystem always 5% of total space reserved to super user (root). If you want to modify during filesystem creating time use -m option. After you can use the tune2fs to change the value by -m option.