You work as the Network Administrator for McNeil Inc. The company has a Unix-based network. You want to run a command that forces all the unwritten blocks in the buffer cache to be written to the…

tune2fs is used to adjust tunable filesystem parameters on ext2/ext3/ext4 filesystems, not to flush buffer cache to disk.

The 'sync' command instructs the kernel to write all dirty (unwritten) buffer cache blocks to the underlying storage device immediately. It is a standard POSIX utility that ensures in-memory filesystem changes are persisted to disk, and is commonly used before unmounting filesystems or rebooting to prevent data loss.

swapoff disables the use of a specific file or partition as swap space, which is unrelated to flushing buffer cache writes.

swapon enables a file or partition for use as swap space, which has no function in flushing unwritten buffer cache blocks to disk.