A Theme Switcher

This article shows how to create a Sass mixin for a colored button. The button's foreground color is dynamically chosen between either black or white, depending on the given background color.

It's a nice intro into @if and @else conditionals ...

By convention, common protocols use a defined port, like 80 for HTTP or 443 for HTTPS.

You can use nmap to find out what service is running behind a given port, and most often see some details about it. This can be helpful if servers don't offe...

xterm by default uses black text on white background.

To change that to something like "light gray on black", do a

vim ~/.Xresources

...and put this in there:

xterm*background: black
xterm*foreground: lightgray

Afterwards, feed ...

Here is a hacky way to load dumps directly from the source server, without fully copying them over and extracting them first.

It [may break horribly for you](https://makandracards.com/makandra/595-dumping-and-importing-from-to-mysql-in-an-utf-8-s...

If you want to have a new log file every day automatically, but avoid using logrotate, the CustomLog directive is your friend:

CustomLog "|/usr/sbin/rotatelogs /opt/www/awesome-project/log/access.%Y-%m-%d.log 86400" combined

Adding that ...

There are a bunch of basic functional elements to building out a popular Rails app that I've never really seen explained in one place, but we had to learn the hard way while building Posterous.

select2 is a great jQuery library to make (large) <select> fields more usable.

For Bootstrap 3 there is select2-bootstrap-theme.
It won't work for Bootstrap 4, ...

AWstats is build to regularly run on webservers. If you want it to build a report once, here is the minimal configuration you need:

Put the following into the awstats config file (look into /etc/awstats/awstats.conf.local or look into `/etc/aws...

Capybara allows you to select DOM elements, e.g. by using field, find_field(...) or field_labeled(...):

role_select = field_labeled('Role')

In the example above, role_select is now a Capybara::Driver::Node. You can call a [number o...

Be careful!
The following solution will delete files on a volume. If you don't know exactly what you're doing, you can run into big trouble with your computer.

I play mp3 files on my car stereo that are stored on a SD-C...