From OpenVMS DCL Dictionary:
The Ctrl/T function displays a single line of statistical information about the current process. When you press Ctrl/T during an interactive terminal session, it momentarily interrupts the current command, command procedure, or image to display statistics. The statistical information includes the node and user names, the current time, the current process, CPU usage, number of page faults, level of I/O activity, and memory usage. For example:
BOSTON::SMITH 16:21:04 EDT CPU=00:00:03.33 PF=778 IO=296 MEM=277
What is Linux for OpenVMS DCL Ctrl/T?