Which command allows you to view disk I/O specific to swapping?

The command that allows you to view disk I/O specific to swapping is vmstat. This utility provides a snapshot of various system processes, including information about memory, paging, processes, I/O, and CPU activity. Within its output, it specifically includes fields related to swapping, such as the number of pages swapped in and out, which can be very useful for monitoring performance and resource usage related to swap operations.

The command swapoff is used to disable swapping on a specified device or file, and does not provide monitoring information. The command ipset is associated with managing IP sets for firewall rules and is unrelated to disk I/O or swapping activities. The command free provides an overview of memory usage, including total, used, and free memory, but does not focus specifically on disk I/O associated with swapping. Thus, vmstat is the correct choice for viewing detailed disk I/O information related to swapping activities.