Tech Rescue

Hector Perez

How to see available disk space in Linux

Playing around with a Raspberry PI I came to need this info. Here is the command: df -h You should see something similar to this: pi@raspberrypi:~ $ df -h Filesystem Size Used Avail Use% Mounted on /dev/root 26G 6.5G 18G 27% / devtmpfs 334M 0 334M 0% /dev tmpfs

How to know which Linux version you are running

Easy peasy! Run the following command in a Terminal: lsb_release -a You should see something similar to this: pi@raspberrypi:~ $ lsb_release -a No LSB modules are available. Distributor ID: Raspbian Description: Raspbian GNU/Linux 10 (buster) Release: 10 Codename: buster

How to reset Raspbian 10 (Buster) password on Raspberry PI 4

Hey! if you are reading this chances are you forgot the password to your Raspberry PI. Worry not though here is how to reset it on Raspbian 10 Buster using a Raspberry PI 4, I don’t really think the model of Raspberry PI matters but it’s just to

How to delete a collection of IDs in POSTMAN

Today I had to delete several objects that I created when testing an API. It was very easy to click the Send button and create a bunch of stuff but now I have to clean the DB. I am using Postman as testing tool and I chose to execute the

How to delete a WordPress.com website

If you are like me and you have a new hosting service for your blogs you may know that after moving from WordPress.com to WordPress.org you may want to delete that old website. Here is how to do it. 1. Open your web browser and navigate to the

Base64 URL Safe Encoding / Decoding (RFC-7515)

A few days back I was required to encode some string in base 64 URL safe. After some research I found that there are several variants of base 64. The one implemented in the code below corresponds to RFC-7515. Here is the code: function encodeBase64Url(str) { let s = new Buffer(

How to remove documents from a capped collection in MongoDB

You can’t remove one or all documents from a capped collection in MongoDB. BUT! you can drop the collection! Execute the following command: db.getCollection('myCollection').drop() The result for me is: true There you go, quick and easy. Sources: * https://docs.mongodb.com/manual/core/capped-collections/ * https://stackoverflow.