How to check running process in Ubuntu using command line

I am a new sysadmin for the Ubuntu operating system. How do I check running process in Ubuntu using the command line option?

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Linux disable firewall command

I am a new Linux system administrator. I have a hardware-based firewall, so I don’t need a firewall on each server. How do I disable the firewall on Linux?

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How do I check if a port is in use on Linux?

I am a new Linux system user. I need to find out which process is listening on a port on Linux using the command line. How do you find out which process is listening on a port on Linux operating systems?

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Linux bash exit status and how to set exit status in bash

Can you explain bash exit status code? How do I set bash exit status in my Linux shell scripts?
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Linux bash exit status and how to set exit status in bash

Can you explain bash exit status code? How do I set bash exit status in my Linux shell scripts?
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Linux bash exit status and how to set exit status in bash

Can you explain bash exit status code? How do I set bash exit status in my Linux shell scripts?
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RHEL 8 install Python 3 or Python 2 using yum

I need to install Python 3 for Ansible IT automation tool on RHEL 8. How do I install Python 3 on RHEL 8? Is it possible to install Python 2 for legacy apps on RHEL 8?
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How to install htop on Alpine Linux using apk

I am a new user of Alpine Linux. How do I install htop on Alpine Linux using the apk command?
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Linux kernel 5.0 released and here is how to install it

Linus Torvalds the creator and the principal developer of the Linux kernel announced the release of Linux kernel version 5.0. This release increases the major kernel version number to 5. from 4.x. The new change does not mean anything and does not affect programs in any way. From the mailing list:
Te overall changes for all of the 5.0 release are much bigger. But I’d like to point out (yet again) that we don’t do feature-based releases, and that “5.0” doesn’t mean anything more than that the 4.x numbers started getting big enough that I ran out of fingers and toes.
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Configure Ubuntu Pi-hole for Cloudflare DNS over HTTPS

I installed OpenVPN VPN solutions on Ubuntu for my businesses to secure all data communications. I also set up Pin-hole ad blocker on Ubuntu server along with OpenVPN. How do I force Pi-hole to use Cloudflare DNS over HTTPS (DoH) to increase my privacy and security by preventing eavesdropping and manipulation of DNS data by man-in-the-middle attacks?
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