In Linux, which command is used to display disk usage statistics?

The command used to display disk usage statistics in Linux is 'df'. This command provides information about the filesystem disk space usage, showing the total space, used space, available space, and the mount point for each filesystem. It's particularly useful for checking how much disk space is left on your system, which is critical for maintaining system performance and making sure that applications have the space they need to operate effectively.

While the other options have their specific purposes, they do not primarily focus on displaying overall disk usage statistics. 'du', for example, is used for displaying disk usage for specific directories and provides a more granular view of space used by files and directories rather than the entire filesystem. 'fdisk' is a utility for managing disk partitions, and 'parted' is also related to partitioning and managing disk storage, neither of which provide information about filesystem utilization in the way that 'df' does.