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  1. Rob

    You can now advertise "self-service" on

    If you're looking to reach 350K+ visitors/mo, you can now self-service advertise on More info here: PM me if you have any questions - thanks for taking a look! Rob
  2. Rob

    create an array of multiple multi-line text for script to use..

    So, main purpose of this is so a QA guy can run this script to update /etc/hosts on one of the qa-test VMs to ensure they're hitting the correct cluster of hosts.. I grabbed most of this from two stackexchange answers: The /etc/hosts stuff...
  3. Rob

    New Keybase chat group

    I started a chat group on Keybase for anyone who's interested: Keybase is a bit like slack or discord, but I like it because it's encrypted. Take a look-see and come by to say hello!
  4. Rob

    Add timestamp + change history size in your linux history

    The Linux history command is awesome by default, but you can make it better! By default, it'll only hold about 1000 past commands, but you can increase that - you can also add time/date to it so you can see when you ran each command! In your ~/.bashrc file, simply add some lines like...
  5. Rob

    Find your top 10 linux commands in your history

    Linux is a great thing that it'll keep a history of the commands you time in the ~/.bash_history file. If you'd like to see the 10 top commands you use, you can run something like the following to see what you type out the most! cat ~/.bash_history | sort |uniq -c|sort -nr|head -n 10 It...
  6. Rob

    Red Hat Summit 2020 moved to free virtual event

    Red Hat is canceling the physical Red Hat Summit presence in San Francisco and rebuilding it as a free, multi-day, virtual event from April 28-29, 2020. This is a great opportunity to those that wouldn't normally be able to make the trip - or afford the tickets/airfare. More info on the event...
  7. Rob

    I'm looking to tail a file while ignoring 3 different strings and the line under them

    So, i have a domain name querying script.. it generates 4 char strings, then adds .com to the end and does a whois on them. When whois returns 0, it prints ' available' in a text file (/tmp/list.txt). So, while this is running, i'm tailing /tmp/list.txt.. I also have stderr going...
  8. Rob

    Has anyone set up Keybase SSH to manage access by various teams?

    More info: We have it set up at work to test currently - it looks real nice, and seems like a great way to manage people and their access across various servers, etc.. Anyone else try it?
  9. Rob

    Kali Linux Revealed - free ebook

    If you are looking to get more familiar with Kali Linux, I'd recommend you take advantage of this free Kali Linux ebook. It goes over acquiring, installing and using Kali Linux from an operations standpoint - it does not go into any detail on the security tools included. I feel too many people...
  10. Rob

    Kali Linux has non-root user policy starting with version 2020.1

    Kali used to have a root-user policy - meaning, you didn't sign in as 'joe' and use sudo to gain root permissions.. you logged in as root and did everything as root. Beginning with version 2020.1, they have implemented a non-root user policy.. More info here...
  11. Rob


    Hey there, welcome to! I'm a big fan of Kali Linux, so decided to create a forum section for it here on Kali Linux is built as a pentesting distribution - and it is assumed that you have decent enough Linux experience to be able to troubleshoot things like network...
  12. Rob

    While OpenShot is open, other apps can't use the codecs?

    I'm using Ubuntu Linux 19.10 (pop_os actually) and OpenShot 2.4.4 from appimage - also tried 2.5.0 release candidate. While I have OpenShot open, I'm not able to play audio/video from other applications. For instance, YouTube videos or YouTube audio library (mp3s) . Once I close OpenShot...
  13. Rob

    System76 Darter Pro (darp6) with coreboot benchmarks

    Tonight I benchmarked my System76 Darter Pro (darp6) with coreboot using sysbench and geekbench. The current setup includes the 4.9ghz i7 cpu, 64gb memory and 500 nvme drive. Below is a video of me performing the benchmarks, as well as the benchmark numbers themselves... sysbench cpu test...
  14. Rob

    TUIR - Command line Reddit

    Most workplaces don't endorse the browsing of reddit while you're being paid to work - in fact, I can't think of any that do.. while that's true, it never hurts to have 1/3 or 1/4 of your terminal assigned to your favorite subreddits out there while you're fighting the good fight. This is an...
  15. Rob

    System76 Darter Pro (darp6) first looks

    I received my new Darter Pro (darp6) yesterday as my new 'work' laptop. My upgrades were the cpu, memory and the drive: 1× 4.9 GHz i7-10510U (1.8 up to 4.9 GHz - 8MB Cache - 4 Cores - 8 Threads) $199.00 1× 64 GB Dual Channel DDR4 at 2666 MHz (2x32GB) $499.00 500 GB NVMe Seq Read: 3,500...
  16. Rob

    Video - Copying, Moving and Deleting files/directories in Linux

    This video goes through copying, moving and deleting files and directories in Linux. This is a video from my series of chapters in my book "Essential Linux Command Line". If you want $50 in free Digital Ocean credit, please click this affiliate link: Please...
  17. Rob

    Video - Linux File Permissions (chmod and chown)

    The following video shows you how to use chmod and chown to change up file permissions. It also goes over the various settings you can apply to files with chmod. Here is a quick cheat sheet for chmod: 7 = 4+2+1 (read/write/execute) 6 = 4+2 (read/write) 5 = 4+1 (read/execute) 4 = 4 (read) 3...
  18. Rob

    Use an SSH key to log into a remote server

    When you ssh into a remote server, the safest way is to use an ssh key. This video shows you how to create the key, explains the files created by the ssh-keygen command, and shows you how to copy your public key to the remote server. Please subscribe if you liked this video - we're trying to...
  19. Rob

    Overview of Linux system + getting around

    In this video, we'll go over the basics of a Linux system - where Linux keeps all of its things - as well as basic commands to get around. This is a short 30 minute clip of me going over the first 2 chapters of my "Essential Linux Command line" book available on Amazon. The book is available...
  20. Rob

    off-topic rules

    Wanted to set some ground rules for the off-topic section. This section is for light hearted conversations that wouldn't belong in a linux-related section. If things get too serious or end up taking up moderators' time, then we'll get rid of it.. we're pretty lax around here, but this forum...