PID：ID of the process
USER：Process owner
PR：The priority level of the process is smaller and the priority is implemented.
NI：nicevalue
VIRT：Virtual memory occupied by process
RES：Physical memory occupied by process
SHR：Shared memory used by processes
S：The state of the process. S means dormancy, R means running, Z indicates dead state, and N indicates that the process priority is negative.
%CPU：Process occupancy rate of CPU
%MEM：The percentage of physical memory and total memory used by processes
TIME+：The total CPU time occupied after the process starts, that is, the cumulative value of CPU occupancy time.
COMMAND：Process startup command name
