How to Restart Sound Driver on a Mac
So for some strange reason, your audio has stopped playing through the Macbook Pro speakers, but if you plug in an external audio device, it… Read More »How to Restart Sound Driver on a Mac
CLI
How to tell what the CHMOD value of a file/directory is
chmod alters the permissions for a file or directory, you could allow full read/write access to a file or directory by running the following command:… Read More »How to tell what the CHMOD value of a file/directory is
How to cleanup a /var/log/journal in Linux
You may find your /var/log/journal directory taking up a lot of disk-space. How do you go about removing, or deleting all these files without the… Read More »How to cleanup a /var/log/journal in Linux
Get the total size of all the files in a directory
It’s amazing how many times I’ve need to find out the total size of all the files in a directory on one of our servers.… Read More »Get the total size of all the files in a directory
Tail and Grep: display all output but highlight search matches
I tail logs quite a lot. An example would be to tail the Apache2 access logs. This is simple to do: This will show a… Read More »Tail and Grep: display all output but highlight search matches
How to replace newlines with commas in CLI
If you need to replace all newline characters with a comma, or perhaps some other delimiter, then using the build-in tr utility will work very… Read More »How to replace newlines with commas in CLI
How to remove files without a certain extension?
You have a directory with a lot of files, and you want to delete only the files that don’t match a specific extension. This is… Read More »How to remove files without a certain extension?
How to debug an Apache 404 error
So you are getting an error 404 or perhaps even worse, a 500! The error in your Apache2 logs looks something like this: ***.162.245.*** -… Read More »How to debug an Apache 404 error
How to Change the Timezone on Ubuntu Server
If you’ve ever typed date into your Ubuntu Server and seen a different time or timezone appear than you expected, then it probably means that… Read More »How to Change the Timezone on Ubuntu Server
Learn Golang as a Python Developer
Learning Go or Golang as a Python developer, programmer or software engineer is easier than you think. While there are quite a lot of things… Read More »Learn Golang as a Python Developer
Remove Special Characters in a String using Bash
Programming languages provide the ability to remove special characters from a string quite easily. Sometimes you need to also do this from your command-line using… Read More »Remove Special Characters in a String using Bash
How to Always run Python 3 from Bash
Given a directory that contains: We can create a runme.sh file to always make sure we are running python 3. Create a shell script Create… Read More »How to Always run Python 3 from Bash
How to Push Docker Images to AWS ECR
Docker images are usually stored on Docker Hub, but AWS’s Elastic Container Registry can also be used. It’s a great solution and this post teaches… Read More »How to Push Docker Images to AWS ECR
How to monitor Network Traffic on Linux
There is a fantastic tool to see and monitor Bandwidth and Network Traffic on Linux. It’s called bmon and it works out of the box.… Read More »How to monitor Network Traffic on Linux
How to use Screen on Linux
Screen on Linux is a popular command-line program that lets you multiplex between interactive shells. What that means is, you can use screen to save… Read More »How to use Screen on Linux
How to Package a Python App using Nuitka
Learn how to package a Python app in this tutorial. For the most part, once you’ve written your Python code, you simply deploy it to… Read More »How to Package a Python App using Nuitka
Introduction to NPM
What is NPM? NPM stands for Node Package Manager, and is the default way to extend your Node applications. There are an absolute ton of… Read More »Introduction to NPM
How to create a Symbolic Link on Linux / Mac
A symbolic link – or often just sym-link – is a pointer or shortcut to where the actual file lives on a filesystem. What does… Read More »How to create a Symbolic Link on Linux / Mac
Non-interactive git clone (ssh fingerprint prompt)
If you have ever been in the annoying situation where you had to run git clone from a server that you did not have interactive… Read More »Non-interactive git clone (ssh fingerprint prompt)
How to exit Vim
If only I had a dollar for every time I saw someone sitting at their computer, trying for the life of them to exit vim… Read More »How to exit Vim
How to Delete large amount of files in directory
So you have clearly got a very large amount of files! If you issue the conventional rm -rf * within the directory, you will get… Read More »How to Delete large amount of files in directory
How to Merge multiple files, removing duplicate values
If you have multiple files and you want to remove duplicate values from, while creating a single file. File1 (one.txt): File2 (two.txt): As you can… Read More »How to Merge multiple files, removing duplicate values
Just SSH to my Jump Box!
I am a professional software engineer and do an absolute ton of devops work as well. I’ve actually never been hired into devops roles as… Read More »Just SSH to my Jump Box!
Connection broken by ‘SSLError(SSLError(1, ‘[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)’
This happens when your machine does not have the correct certificate bundle to access the Pypi repository, or you are behind a corporate proxy that… Read More »Connection broken by ‘SSLError(SSLError(1, ‘[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:777)’
Get the output of an application logged in the terminal
Just a quick note: You are probably looking for a Linux command called `dtrace`. If you’re on a mac then you are probably looking for… Read More »Get the output of an application logged in the terminal