Jan 2017

By Default, htop is not installed on Linux, it is not part of a minimal install on a software only ISO (although a customer could have added it themselves)

On a brand new Linux, you will have to either:

Update the repositories to be able to install htop, please check out this wiki page first (or the install will fail)
CentOs 7 no WGET install EPEL

Or

Just download the htop library, and install that

curl -O https://dl.fedoraproject.org/pub/epel/7Server/x86_64/h/htop-2.0.2-1.el7.x86_64.rpm

The above example is for CentOS 7, use the correct path for your CentOS version

Bear in mind that the htop version might change

The installation of htop is very simple, you just need to type in to the console:

  yum install htop -y

yum install htop -y

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * epel: epel.check-update.co.uk
 * epel-debuginfo: mirrors.coreix.net
 * epel-source: mirrors.coreix.net
 * epel-testing-debuginfo: mirrors.coreix.net
 * epel-testing-source: mirrors.coreix.net
Resolving Dependencies
--> Running transaction check
---> Package htop.x86_64 0:2.0.2-1.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================================
Package         Arch                    Version             Repository               Size
==============================================================================================
Installing:     htop                    x86_64              2.0.2-1.el7 epel         98 k

Transaction Summary
==============================================================================================
Install  1 Package

Total download size: 98 k
Installed size: 207 k
Downloading packages:
htop-2.0.2-1.el7.x86_64.rpm                                     |  98 kB  00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : htop-2.0.2-1.el7.x86_64                          1/1
  Verifying  : htop-2.0.2-1.el7.x86_64                          1/1

Installed:
  htop.x86_64 0:2.0.2-1.el7

Complete!

On CentOS 6 and earlier you will get htop v1.x.x.x

On CentOS 7 you get htop v2.x.x.x