Howto's

In this howto, we will see how to remove the blue throbber image and related markup when you click on an ajax link and replace with a custom throbber image.

Any form element or link can be made ajax by setting #ajax property. But #ajax property is tied closely to drupal form elements. There is another way in drupal to convert a link to use ajax, by setting 'use-ajax' class. But for those links the progress type is always throbber.

In this howto we will look at one of the many ways to change to our custom throbber.

Dmideocde is a wonderful utility to get detailed information about your system’s hardware components. It extracts the information from the computer’s Desktop Management Interface(DMI) and displays in a human readable format. Please note that, it doesn’t probe the devices in order to gather the information, it just reads it from some data structures.

Uptime is the amount of time a machine has been up and running, providing all its services without any downtime. For a linux machine, this information can be found out using the “uptime” command. Along with the uptime, this command also tells you how many users are currently logged in and the load on the system in the past 1, 5 and 15 minutes.

We all use ssh to access machines remotely, but not many know that instead of using a shell we can use ssh to simply run a command on the remote system. Just add the command, you want to be executed, after the user@host part and instead of throwing an interactive shell, ssh will run the command on the remote machine and show you the output(if any).

Here is a simple illustration:

Many a times you will feel the need to view a constanly updating file. This is a common case with logs. People usually think that tail command is only used to view the last parts of a file, but it even provides you with the ability to view growing/changing files.

Please note that, by growing I mean files to whom data is being appended constantly. Using the “-f” option, tail lets us view the data that is being added to the file in real time.