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  • in Linux
  • 2 min read

Getting the HP USB-C/A Universal Dock G2 working with Fedora 41

I have a HP Elitebook 840 G7 that I use along with a HP USB-C/A Universal Dock G2. Now, this has been working fine in Windows, but when I changed to Fedora, not so much. I had to plug in my HDMI cable directly to the laptop, and not the docking station. It just wasn't working. This is what I did to fix the issue.

  • in Linux
  • 6 min read

Introduction to tmux

I have been working with Linux for years, and I've always used screen when working in the terminal. I even wrote a small introduction to screen over 10 years ago.

So you can imagine my surprise when I at a very late point found out about tmux. It has completely changed the way I work, and boy do I love it.

  • in Linux
  • 8 min read

Ansible EX294 practice exam and solutions

I am hopefully going to take the second half of my RHCE exam this year, which is EX294. I have taken inspiration from and , and have decided to provide my own answers and explanations as I myself prepare for the exam.

I’ve also only used 4 VM’s in total, 1 controller and 3 nodes, and not 4 nodes as the practice exam suggests.

Here are the tips that I’ve found helpful so far:

  • in Linux
  • 2 min read

SimpleHTTPServer with SSL

python -m SimpleHTTPServer

and the result:

jorge@applepie:~ $ python -m SimpleHTTPServer 8080
Serving HTTP on 0.0.0.0 port 8080 ...

It listens on all IPv4 interfaces, and binds to the port you specify, which in my case is 8080. The person on the other side will then be able to access the files in the directory from the outside by going to http://server1.example.com:8080, provided that your machine has the hostname server1.example.com, and that you have the port 8080 forwarded to the IP of server1.

VMware, i3 and multiple monitors

For a while now I’ve been trying to set up VMware to work with multiple monitors, in a Linux guest. With some windowmanagers it works out of the box without any issue, such as with Unity. I never figured out how to do it with xmonad, and recently I switched to i3 just to try something new. The damn “Cycle multiple monitors” button didn’t work here either. When I tried it, a message popped up saying:

The virtual machine must have up-to-date VMware Tools installed and running.

  • in Linux
  • 4 min read

ncat, a modern implementation of netcat

ncat is a utility that is like the UNIX cat command but for network connections. It’s based on the original netcat and comes with a couple of more modern features.

In this short post, we’ll go through a couple of examples to see exactly what uses this tool has. I’m currently using ncat version 7.01, in Ubuntu 16.04. ncat is a part of the nmap package in Ubuntu.

  • in Linux
  • 1 min read

Split a file into a number of equal parts

As an example, we have a file named primary_data_file.txt that contains 616 lines of data. We want to split this into 4 files, with the equal amount of lines in each.

$ wc -l primary_data_file.txt 
616 primary_data_file.txt

The following command should do the trick:

split -da 1 -l $((`wc -l < primary_data_file.txt`/4)) primary_data_file.txt split_file --additional-suffix=".txt"

The option -da generates the suffixes of length 1, as well as using numeric suffixes instead of alphabetical.

The results after running the command are the following files:

$ wc -l split_file*
  154 split_file0.txt
  154 split_file1.txt
  154 split_file2.txt
  154 split_file3.txt
  616 total
  • in Linux
  • 1 min read

Test if a port on a remote system is reachable

With telnet:

telnet webserver.example.com 80

With bash:

cat < /dev/tcp/webserver.example.com/80

Replace tcp with udp, depending on what you want.

With netcat:

nc webserver.example.com 80 &> /dev/null; echo $?

If the port is open, you will get an output of 0. If it’s closed, it’s a 1.