Command Line Polling
In an ideal world, we wouldn't have to poll for anything; we would always have events to trigger other functions. This isn't an ideal world, however, so it's important to know how to poll in multiple programming languages. I've covered JavaScript polling (with and without Promises), but what about command line polling? For example, ensuring MYSQL is up before attempting to perform more operations.
Here's the basic syntax:
# while ! (command here); do
while ! mysql -uroot; do
sleep 1
done
The example above performs the mysql -uroot operation (which will fail until mysqld is up) every second. Keep in mind the poll operation you run should be as simple as possible, just enough to know that what you want to use is available!
![CSS Animations Between Media Queries]()
CSS animations are right up there with sliced bread. CSS animations are efficient because they can be hardware accelerated, they require no JavaScript overhead, and they are composed of very little CSS code. Quite often we add CSS transforms to elements via CSS during...
![Animating CSS3 Transforms with MooTools Fx]()
![Optimize Your Links For Print Using CSS — Show The URL]()
When moving around from page to page in your trusty browser, you get the benefit of hovering over links and viewing the link's target URL in the status bar. When it comes to page printouts, however, this obviously isn't an option. Most website printouts...
![jQuery Comment Preview]()
I released a MooTools comment preview script yesterday and got numerous requests for a jQuery version. Ask and you shall receive! I'll use the exact same CSS and HTML as yesterday.
The XHTML
The CSS
The jQuery JavaScript
On the keypress and blur events, we validate and...