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htop <===> process viewer that is similar to the well-known "top" program, but provides much more features

#<------------------------------- Useful Shortcut Keys ------------------------------->#

u <===> displays all processes owned by a particular user.
p <===> sort processes on high CPU consumption.
m <===> sort processes on high memory consumption.
t <===> sort process on time.
Space <===> tag a process
c <===> tag a process and child processes
Shift + u <===> remove all tags.
Shift + f <===> highlight and follow a process.
Shift + h <===> show/hide user and kernel processes.
a <===> set what CPU cores a process can access.
i <===> set IO priority.
h <===> help menu.

#<------------------------------- CPU bar ------------------------------->#

Blue <===> low priority processes.
Green <===> normal (user) processes.
Red <===> kernel processes.

#<------------------------------- Memory bar ------------------------------->#

Green <===> used memory pages.
Blue <===> buffer pages.
Yellow <===> cache pages.

#<------------------------------- Tasks ------------------------------->#

Tasks are the number of open processes on the system. There are three values shown: the total number of tasks (processes) on the machine, the number of threads those tasks are broken up into, and the number of tasks currently running.

#<------------------------------- Load Average ------------------------------->#

Load average is a measure of the computational work performed by the CPU. A single-core CPU with 100% utilization has a 1.0 load average. A quad-core CPU with 100% utilization has a 4.0 load average. There are three load average numbers listed, representing the one-minute average, five-minute average, and fifteen-minute average.

#<------------------------------- Process Information ------------------------------->#

PID <===> process ID number.
USER <===> process owner.
PRI <===> process priority by the kernel.
NI <===> process priority reset by the user or root.
VIR <===> virtual memory the process is consuming.
RES <===> physical memory the process is consuming.
SHR <===> shared memory that the process is consuming.
S <===> current process state.
CPU% <===> percentage of CPU that the process is consuming.
MEM% <===> percentage of memory that the process is consuming.
TIME+ <===> time measured in clock ticks since process execution started.
Command <===> name of the command that started the proces