Clearing a postfix queue for mails sent to a specific email address

Hello, to clear a queue you just need to run the following command, but obviously changing my email for the one that you need

postqueue -p | tail -n +2 | awk 'BEGIN { RS = "" } / dnetix@gmail\.com/ { print $1 }' | tr -d '*!' | postsuper -d -

Install Samsung ML-1675 drivers on Mac OS Sierra

Samsung apparently stopped the development of drivers on the version Mac OS X 10.6, so if you upgraded to Sierra and you still need to install your printer, follow the steps

  1. Download drivers from Apple Support:
  2. On the installation this one appears as (Samsung ML-1670 Series), add the printer
  3. Use the drivers for Samsung ML-1860 Series

This solution worked because CUPS generated the error:

INTERNAL ERROR – Please use proper driver.
SYSTEM: h6fw_5.49/xl_op
LINE: 180
VERSION: SPL 5.49 10-20-2010
And looks like the 1600 series is the 1860 in the USA.


Uninstall MySQL Server on Mac OS

When I upgraded from Mac OS X 10.12 (Sierra) to 10.13 (High Sierra) suddenly my MySQL Server just broke down and it was unrepairable, so I’m going to try to install it with brew, but in order to do that I needed to uninstall the current one and this is a clean way to do it

Just run the following commands

sudo rm -rf /usr/local/mysql
sudo rm -rf /usr/local/mysql*
sudo rm -rf /Library/StartupItems/MySQLCOM
sudo rm -rf /Library/PreferencePanes/My*
rm -rf ~/Library/PreferencePanes/My*
sudo rm -rf /Library/Receipts/mysql*
sudo rm -rf /Library/Receipts/MySQL*
sudo rm -rf /private/var/db/receipts/*mysql*
sudo rm /Library/LaunchDaemons/

I had a problem with a configuration file, so it’s better to remove it

sudo rm /etc/my.cnf

Fix Malformed UTF-8 characters, possibly incorrectly encoded error on Eloquent

This is one of those errors that are pretty much undocumented and can lead to a huge waste of time trying to figure it out why, so I’m going to tell you how I fix it and hope that helps you too.

I was trying to add binary data into the database using the save() method on the Model and it keep failing time after time saying:

InvalidArgumentException: Malformed UTF-8 characters, possibly incorrectly encoded in ../vendor/laravel/framework/src/Illuminate/Http/JsonResponse.php

To fix this on Laravel you just need to make sure that you are inserting correctly the information, after a while I realize that I was inserting some truncated data on the table and the exception thrown by Eloquent was catched by the exception handler, and it contained some binary data that was being responded afterwards.

So this is just an error generated because the system was trying to report another previous error, now after the stress it’s gone, it’s kind of funny.

Use shared folder to develop with a VirtualBox Ubuntu Server guest

Recently the company that I work for change my Lenovo T440 with Ubuntu 16.04 for a MacBook Air with macOS and although I never really liked Mac (Too expensive for the specs provided) I loved the change but there are several differences that, when it comes to web development, I need to take in account, so I just installed a local Ubuntu 16.04 server with VirtualBox to test my work before to put it out.

To avoid having to pull the source code each time I just wanted to share the development folder with the guest machine and in order to do that we need to make the following steps

Install the VirtualBox Guest Additions in the guest

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