Robert Mann

25 Flips | 4 Magazines | 30 Likes | @RobertMann50nh | Keep up with Robert Mann on Flipboard, a place to see the stories, photos, and updates that matter to you. Flipboard creates a personalized magazine full of everything, from world news to life’s great moments. Download Flipboard for free and search for “Robert Mann”

10 PowerShell cmdlets to speed network troubleshooting

The right PowerShell cmdlets can help you identify network issues and resolve connectivity problems quickly and easily. Here are 10 to get you …

Linux

A Linux Sysadmin’s Guide to Network Management, Troubleshooting and Debugging

A system administrator’s routine tasks include configuring, maintaining, troubleshooting, and managing servers and networks within data centers. …

10 Free DevOps-Friendly Security Tools Developers Will Love

Start building an affordable DevSecOps automation toolchain with these free application security tools.

Information Security

Nmap Cheatsheet

Nmap Quick commands<p>Ping Sweep<p>example<p>or<p>List Scan aka reverse-dns lookup<p>On a corperate network this is a bit better of a scan due to enumeration of …

Linux

Wake up and Shut Down Linux Automatically

Title: Wake up and Shut Down Linux Automatically30 NovLearn more

Linux

Writing a Simple Linux Kernel Module

Grabbing the Golden Ring-0Linux provides a powerful and expansive API for applications, but sometimes that’s not enough. Interacting with a piece of …

LibreOffice: A cheat sheet

LibreOffice is a cross-platform, open source office suite. If you're looking for a free alternative to Microsoft Office or G Suite, read about …

12 MySQL/MariaDB Security Best Practices for Linux

MySQL is the world’s most popular open source database system and MariaDB (a fork of MySQL) is the world’s fastest growing open source database …

Databases

Visualising SSH attacks with R

If you have any machine with an SSH server open to the world and you take a look at your logs, you may be alarmed to see so many login attempts from …

SSH

How to Manage Users with Groups in Linux

Title: How to Manage Users with Groups in Linux1 DecLearn more

Linux

How to use the Linux iostat command to check on your storage subsystem

To help troubleshoot your Linux datacenter servers, you need the right tools. Jack Wallen introduces you to one such tool, iostat.<p>If you employ Linux …

How to get started with Wireshark plugins, tools, and scripts

Wireshark is the best network packet analyzer, in my opinion. What’s really cool is that it’s FOSS. I wrote a couple of guides for newbies here:<p>This …

How To: Use SSH Local Port Forwarding to Pivot into Restricted Networks

SSH is a powerful tool with more uses than simply logging into a server. This protocol, which stands for Secure Shell, provides X11 forwarding, port …

Batch renaming images, including image resolution, with awk

The most recent item on my list of "Geeky things I did that made me feel pretty awesome" is an hour's adventure that culminated in this code:<p>The last …

Bootstrap 4: Everything You Need to Know

A deep dive into solving common responsive web design problems<p>This article will cover the practical fundamentals you need to start building …

Why and how you should switch to Linux

It's time for a change.<p>When you start comparing computers, you probably pit Windows against macOS—but Linux rarely gets a mention. Still, this lesser-known operating system has a strong and loyal following. That's because it offers a number of advantages over its competitors.<p>Whether you're …

Hackers are targeting schools, U.S. Department of Education warns

When Superintendent Steve Bradshaw first received a threatening text message in mid-September, he didn't know it was coming from a hacker trying to exploit his Montana school district.<p>But soon, students and other schools around Flathead County were receiving threatening messages, too. More than 30 …

20 essential Windows keyboard shortcuts to save you a click

The basics<p><b>Ctrl+Z</b>: Undo<p>No matter what program you're running, Ctrl+Z will roll back your last action, whether you've just overwritten an entire …

AWS Adventures (Part 3): Post Mortem on Lambdas

Friends have asked that I report from the trenches to update on my thoughts on Lambdas. I fell in love about a year ago, so how do I feel now? I’ll …

20 essential Windows keyboard shortcuts to save you a click

Let your fingertips fly.<p>Compared to reaching for the mouse or navigating a menu, a single keyboard shortcut shaves a moment off your task. This might not seem like much, but add up all those saved moments over a week or a month, and you're gaining a substantial chunk of time. That's why it's …

Chkservice – An Easy Way to Manage Systemd Units in Terminal

Systemd (system daemon) is a modern system management daemon for Linux systems. Systemd is a replacement for init system manager; it controls system …

Linux

Rename All Files and Directory Names to Lowercase in Linux

In our previous article, we have described how to count the number of files and subdirectories inside a given directory. This guide will show you how …

Linux

Kubernetes, Portworx, and WordPress: Scalability and HA

This Kubernetes WordPress HA guide will show you how to horizontally scale WordPress containers on a Kubernetes cluster using Portworx Shared …