The Groovy scripting language supports conditional structures, that can be used in Jenkins pipelines. Assume that you have a parametrized Jenkins job and in a Jenkinsfile you have a variable that should be defined depending on provided parameters. Here is an example of how to conditionally define variables in a Jenkins pipeline using the Groovy […]
SSH: Create Public Key from Private
Usually a public SSH key is generated at the same time as a private key. Unlike a private SSH key, it is acceptable to lose a public key as it can be generated again from a private key at any time. In this small note i am showing how to create a public SSH key […]
Git – Squash Commits: Merge All Commits in Branch Into One
Each time you are working on a bug or a feature, you create a branch for it. Usually, while working in such temporary branches, you make multiply commits without bothering a lot about commit messages and simply comment the changes with something like “work in progress” or just “WIP”. Before merging such branch into master […]
Windows CMD: PATH Variable – Add To PATH – Echo PATH
PATH is an environment variable that specifies a set of directories, separated with semicolons (;), where executable programs are located. In this note i am showing how to print the contents of Windows PATH environment variable from the Windows command prompt. I am also showing how to add a directory to Windows PATH permanently or […]
Get SSL Certificate from Server (Site URL) – Export & Download
Someday you may need to get the SSL certificate of a website and save it locally. For example, you could get an error saying that you can’t clone a Git repository due to a self-signed certificate and to resolve this issue you would need to download the SSL certificate and make it trusted by your […]
Sublime Text: Install Package (Plugin) – Package Control
Sublime Text is one of the most popular code editors with a lot of built-in features. The functionality of Sublime Text can be extremely extended by hundreds of useful plugins. The easiest way to install a package (plugin) for Sublime Text is to use Package Control – the package manager for Sublime Text.
Python: How To Use Pip – Basic Commands
What is Pip? pip is a tool for installing and managing Python packages. With pip command you can install, list, upgrade (update), downgrade and uninstall Python packages. In this post i am showing how to use pip from the command line by giving examples of the basic pip commands.
Vi/Vim – Arrow Keys Don’t Work – Print Letters in Insert Mode
By default, vi/vim text editor uses the h, j, k and l keys for navigation. Hitting arrow keys in the insert mode will insert newlines and print A, B, C, D capital letters. In this small note i will show how to fix not working arrow keys, that print letters in the insert mode in […]
Dropbox Encryption: Encrypted Cloud Storage – Linux – EncFS
Almost all cloud storage services encrypt customers data, however this doesn’t mean that the privacy of this data is protected enough. The most of those services also manage the keys used for encryption, that means that your encrypted folder can be decrypted not only by you. In this article i will show make a private […]
MongoDB: Create User – For Database, Admin, Root
In MongoDB, users can have privileges across different databases. In the following article i will show how to create, show and delete a user in MongoDB. I will also show how to create a user with admin and a user with root (superuser) privileges on the all databases in MongoDB.