Command	Description
pstree	Outputs a process list arranged in a tree-like pattern showing the parent-child relationships between processes.
vmstat	Outputs a snapshot of system resource usage including memory, swap, and disk I/O. To see a continuous display, follow the command with a time delay (in seconds) for updates. Here’s an example: vmstat 5 . Terminate the output with ctrl-C.
xload	A graphical program that draws a graph showing system load over time.
tload	Similar to the xload program but draws the graph in the terminal. Terminate the output with ctrl-C.