Tutorials
Step-by-step technical guides on Docker, Linux, Python, Go, and more.
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Vue.js: Show First and Last Array Elements
Sometimes in templates you need to show the first or last element of an array or you need to close a html tag on the last item while you are doing an iteration. You can just use Vue protototype to extend it: Vue.prototype.$last = function (item, list) { return item === list[list.length - 1] }. Check here for full details.
How to transfer files over the network using Netcat
Netcat is a helpful tool when you are in a hurry to transfer files between machines. Om this tutorial we will explain how to receive and send files using netcat. For receive: nc -l -p 9999 > received_file.txt, For sending: nc 192.168.0.1 9999 < received_file.txt. Check here how to compress and uncompress data using netcat.
How to Show or Hide Files in Finder (OSX)
If you want to show or hide files in finder you can use defaults command. To enable it use defaults write com.apple.finder AppleShowAllFiles TRUE. You need to kill Finder, check here for more details
Test SSL / TLS with GnuTLS from the Command Line
In this tutorial we are going to use gnutls-cli from the command line to test SSL/TLS connection. This command could be useful to test a web or an imap server. Install it with: sudo apt -y install gnutls-bin. Example of usage: gnutls-cli -d 5 imap.gmail.com -p 993
Javascript: How to remove a specific element from an array?
In this small tutorial we will give example on how to remove a specific element from an array with javascript. Code example: var index = array.indexOf(5); if (index > -1) { array.splice(index, 1); }
PMP Exam Preparation Tips and Questions
The Project Management Professional (PMP) is the most important industry-recognized certification. We recommend Rita Mulcahy's book, Andy Crow study PMP guides and Kin Heldmen study guide. We also provide links to free PMP questions. Finally remember the PMBok is your bible! Read here for more details.
JavaScript: Get Dropdown Selected Value
We will explain hot to retrieve the selected element using javascript. e.options[e.selectedIndex].value will return the value of the selected element where e is the variable obtained with document.getElementById("selector"). Check here a full jQuery example also. Read our tutorial for more details.
Backup mongodb with crontab
In this tutorial we are going to explain how to do daily backups of mongodb using cron.
Install go in raspberrypi steps
Follow this steps to install go on the raspberry pi. We don't use apt to install go and instead we download the latest version from https://golang.org.
Mongoengine: FileField for Images and Files
Check here an example on how to use mongoengine filefield. Mongoengine FieldField uses GridFS to store the files, check here how to use it in your project.