Explanation/Reference:
Explanation:
top - display Linux tasks
The top program provides a dynamic real-time view of a running system.
It candisplay system summary information as well as a list of tasks currently being managed by the Linux kernel. The types of system sum-mary information shown and the types, order and size of information displayed for tasks are all user configurable and that configuration can be made persistent across restarts.
Incorrect:
Not A, Not B:
ps displays information about a selection of the active processes.
To see every process on the system using standard syntax:
ps -e
ps -ef
ps -eF
ps -ely
To see every process on the system using BSD syntax:
ps ax
ps axu
Not D: meminfo - provide information about memory
The meminfo() function provides information about virtual and physical memory particular to the calling process. The user or developer of performance utilities can use this information to analyze system memory allocations and develop a better understanding of the factors affecting application performance.