Linux from the command line -- the first network diagnostic command everyone ever learns -- ping

Linux from the command line -- the first network diagnostic command everyone ever learns -- ping

Of course everyone knows ping and how to operate it in it's default mode, but too many people don't learn it's other capabilities. ping is a powerful network diagnostic tool in it's own right and can be used in a lot of creative ways.
I used to use it with the -c option back in the dial-up days in order to cause the auto-connect system to dial up to our ISP and wait for it to show replies before continuing with cron jobs that required Internet access (eg time sync, system updates, etc.)
https://www.howtoforge.com/linux-ping-command/

Linux from the command line -- Using screen

Linux from the command line -- Using screen

I've posted on the screen command several times before, but it's a good tool and since everyone learns differently, it's good to have different sources of reference so here's another one.

Linux from the command line -- Comparing files and directories with diff

Linux from the command line -- Comparing files and directories with diff

Did all those files copy? Are these the same version of that document?
Find out that and more with diff.
https://www.networkworld.com/article/3279724/linux/comparing-files-and-directories-with-diff-and-comm.html

Linux for sysadmins -- Setting up Puppet on CentOS 7

Linux for sysadmins -- Setting up Puppet on CentOS 7

When you step up to the Enterprise level as a Linux sysadmin, you'll need to learn, install, configure, and use an administration system. A real one. That category has two sub-categories. Open Source tools, and commercial tools.
Both are worth learning.
https://www.howtoforge.com/tutorial/centos-puppet-master-and-agent/

Linux from the command line | Linux for sysadmins --- quick and easy e-book reading from the command line with...

Linux from the command line | Linux for sysadmins --- quick and easy e-book reading from the command line with Uniread

Before you discount the idea of command line ebook reading, imagine storing all your server software, hardware, and applications manuals on the server, ready to read from anywhere.
https://www.linuxuprising.com/2018/06/read-ebooks-quicker-with-this-spritz.html

Linux for sysadmins | Linux from the command line -- Who has that package for your Linux distro?

Linux for sysadmins | Linux from the command line -- Who has that package for your Linux distro?

whohas will find sources that carry a particular package. Remember though to always check your official distros first.
https://www.ostechnix.com/find-if-a-package-is-available-for-your-linux-distribution/

Linux for sysadmins -- Monitoring Apache Performance on CentOS 7 Using Netdata

Linux for sysadmins -- Monitoring Apache Performance on CentOS 7 Using Netdata

Running a webserver requires close monitoring to make sure you're not ticking off your customers with a slow website.
https://www.tecmint.com/monitor-apache-performance-using-netdata-on-centos/#