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snapshot of processes running in real time
PID
process ID of the process
USER
username of the owner of the process
PR
priority of the process
NI
nice value of the process
VIRT
total amount of virtual memory used by the process
RES
amount of physical memory the process is using
SHR
amount of memory the process is sharing with other processes
S
process status
%CPU
the share of CPU time that the process is using
%MEM
share of available physical memory the process is using
TIME+:
the total CPU time that the process has used since starting
COMMAND
the command line name of the process (program started)