Problems accessing or browsing HTTPS websites using Opera 12.11+

If you've ever noticed having difficulties using HTTPS websites using Opera 12.11 or up, here's how to fix it. This problem may manifest itself with a minor error or may even block you completely from using a website. You may notice these problems may occur every time or it may be spotty. Here's how I fixed the problem.

Problem: You cannot use HTTPS websites.

Impact: You cannot access email, online shops, etc which all use HTTPS for security.

Tip: Shutdown commands in Linux and Windows

Have you ever been working in a command-line interface wondering how to shutdown or restart? This is not so much a problem per se as it is a list of shutdown/restart commands which may come in handy one day.

Linux/Ubuntu
To shutdown and completely power off right now, you can type at the prompt:

sudo shutdown -h now    OR   sudo shutdown -h 0

To reboot, type at the prompt:

sudo reboot   OR   sudo shutdown -r 0

(Note that the second command means to shutdown and then restart in zero seconds.  The -r flag means to restart.)

Windows
(This came in handy one day when a Windows computer I was trying to revive was so messed up I could only access the command line and not even the safe mode.)

Just type at the command prompt:

shutdown -s   OR  shutdown -s -t 0

In the above examples, the -s flag means to shut down the computer while the -t flag gives the time before shutting down (in the second case, in zero seconds).

Drupal 7 keeps asking for FTP login when trying to install modules/themes using the web interface

After changing ownership of a Drupal installation to the SFTP user using the folder, Drupal started to show peculiar behaviour. Whenever I tried to install any module or theme through the web interface, Drupal 7 would ask for the FTP login credentials. Although making changes through SFTP is okay, sometimes the web interface is much more convenient.

Problem: Drupal 7 would not allow installation through the web interface without needing the user to type in the FTP login.

Impact: Inconvenience.

Creating a "NEW!" flag in Drupal 7 using entities and Display Suite

Have you ever wondered how to flag new content in Drupal? In a website I've worked on, I wanted to find a way to create a "NEW!" flag to flag new content. (Note: If you were only wanting to create a flag that says "NEW!" on the node page for the piece of content you can just use a view, but what if you wanted to have something that marks content as new in a list of node teasers?) Here's how I did it in Drupal 7 using a custom code field with Display Suite.

Problem: A flag or field was needed to display "NEW!" for new content.

Impact: Users won't be able to pinpoint at a glance the new content.

Errors viewing website after changing Drupal theme

While I was pretty new to Drupal, I started playing around with themes, but after changing the theme I started seeing error messages at the top of each webpage. The answer was simple: I forgot to clear the caches!

Problem: Error messages after changing the theme in Drupal.

Solution:
This one's a short one. In Drupal 7, go to Configuration > Development > Performance. You'll see a button labelled "Clear all caches". Click that and you're done!