I am a new user of Red Hat Enterprise Linux 8. How do I install htop on RHEL 8 using the yum command?

Introduction – htop is nothing but Interactive process viewer for RHEL (Red Hat Enterprise) 8 Linux . It is just like default top command with an additional set of options and better display on the screen. This page shows how to install htop on RHEL 8 using yum command.

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How to install htop on RHEL 8 using yum

The procedure for installing htop on Red Hat Enterprise Linux 8 is as follows:

1. Open the terminal window.
2. For remote RHEL 8 server login using ssh command.
3. Enable EPEL repo for RHEL 8 server or desktop
4. Execute yum search htop command to search for htop on RHEL 8
5. Run sudo yum install htop to install htop in RHEL 8

Let us see all steps and command in details.

Enable EPEL repo for RHEL 8

sudo yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
sudo yum update

RHEL 8 install htop

Let us search for htop package using yum command:
yum search htop

Sample outputs:Last metadata expiration check: 0:07:38 ago on Thursday 22 August 2019 04:46:52 PM UTC.
======================================================================== Name Exactly Matched: htop ====
htop.x86_64 : Interactive process viewer

Get information about htop package

Run the following command:
yum info htop
Sample outputs:

Last metadata expiration check: 0:08:20 ago on Thursday 22 August 2019 04:46:52 PM UTC.
Available Packages
Name         : htop
Version      : 2.2.0
Release      : 6.el8
Arch         : x86_64
Size         : 112 k
Source       : htop-2.2.0-6.el8.src.rpm
Repo         : epel
Summary      : Interactive process viewer
URL          : http://hisham.hm/htop/
License      : GPLv2+
Description  : htop is an interactive text-mode process viewer for Linux, similar to
             : top(1).

Install htop

Finally, run the following to install htop on RHEL 8:
sudo yum install htop

How to use htop command

The syntax is:
htop
htop [options]
htop [options] arg

One can use a monochrome color scheme, run:
htop -C
htop --no-color
Want to see the tree view by default when running htop? Try:
htop -t
htop --tree
Let us see only processes of a given user named vivek:
htop -u vivek
htop --user=vivek
htop --user=nginx
Limit and show process for only the given PIDs:
htop -p PID
htop -p PID1,PID2
--pid=PID,[,PID,PID...]
htop -p 1342
htop -p 7435,1367

htop keyboard shortcut keys

The following commands are supported while in htop:

Command	Description
Up arrow key	Select (highlight) the previous process in the process list. Scroll the list if necessary.
Down arrow key	Select (highlight) the next process in the process list. Scroll the list if necessary.
Left arrow key	Scroll the process list left.
Right arrow key	Scroll the process list right.
PgUp, PgDn	Scroll the process list up or down one window.
Home	Scroll to the top of the process list and select the first process.
End	Scroll to the bottom of the process list and select the last process.
s	Trace process system calls: if strace(1) is installed, pressing this key will attach it to the currently selected process, presenting a live update of system calls issued by the process.
l	Display open files for a process: if lsof(1) is installed, pressing this key will display the list of file descriptors opened by the process.
u	Show only processes owned by a specified user.
M	Sort by memory usage (top compatibility key).
P	Sort by processor usage (top compatibility key).
T	Sort by time (top compatibility key).
F	“Follow” process: if the sort order causes the currently selected process to move in the list, make the selection bar follow it. This is useful for monitoring a process: this way, you can keep a process always visible on screen. When a movement key is used, “follow” loses effect.
K	Hide kernel threads: prevent the threads belonging the kernel to be displayed in the process list. (This is a toggle key.)
H	Hide user threads: on systems that represent them differently than ordinary processes (such as recent NPTL-based systems), this can hide threads from userspace processes in the process list. (This is a toggle key.)
p	Show full paths to running programs, where applicable. (This is a toggle key.)
Ctrl-L	Rfresh the screen.
F1	See this help menu.
h	Same as above.
?	Again, same as above.
F10	Quit htop
q	Exit htop (same as above)

How to get help about htop

Simply pass the --help option. For example:
htop --help
man htop

Conclusion

This page showed you how to install and use htop on RHEL 8. For more information see htop home page here.