chia Blogs

Drupal 7: How to remove throbber image from ajax links and create a custom throbber.

Written on October 18th, 2011 at 16:29 pm by chia

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.

How to allow users in a group to run all commands in Fedora / CentOS using sudo

Written on July 8th, 2010 at 00:50 am by chia

This tutorial will guide you on how to allow a group of users to run all the commands without sharing your system root password in Fedora / Redhat / CentOS based Distros.

The difference between Primary and Secondary groups in Linux

Written on July 6th, 2010 at 02:02 am by chia

The security of a file on Linux is managed very well using the concept of ownership and permissions. There can be three kind of permissions - read, write and execute and similary the ownership is divided into three kinds too - a user, group and others. Groups are a great way to share your work or work in collaboration with others by defining a group, whose members have the write to contribute/modify/see the work.

How to change username or UserID/uid on Linux

Written on June 30th, 2010 at 14:33 pm by chia

Usermod is a useful command to manage user settings. It modifies the system account files to reflect the changes that are specified on the command line. It is capable of doing a lot of things, but here we will see how to change username and UserID or uid on Linux using usermod.

How to force inactive users to logout automatically after time out on Linux?

Written on June 17th, 2010 at 21:24 pm by chia

When you work on different servers from your system, the sessions are scattered over various terminals across different workspaces. Its a common mistake people usually make by leaving one or more of those server sessions open. Such sessions can lead to bad things if they get in hands of someone else. So, instead of blaming the user its always a good practice for sys-admins to automatically logout a user who is inactive for quite sometime.

Drupal 7: Convert user login block to use ajax

Written on September 4th, 2011 at 14:07 pm by chia

In this simple how to we will see how we can easily convert drupal 7 user login block to use ajax. This is one of the many methods of using ajax for login block. We will see few cool d7 tricks that makes this very easy.

Before we start lets checkout a quick demo

How to add user to a Group on Linux

Written on July 6th, 2010 at 17:50 pm by chia

Managing users is an important activity in Linux. For a Sysadmin, you want different access permissions for developers, maintainers and moderators. Groups are an easy way to categorize users. Rights/permissions given to a group will be applicable to all its members. In this howto, I will tell you how to add users to a group.

I would suggest you to read about the two types of groups - Primary and Secondary, before proceeding.

How to Change Ownership of a file on Linux

Written on July 5th, 2010 at 03:36 am by chia

File ownership is a way to manage files of different users and share files between users of same groups. Every file in linux is managed by a specific user and a group. The chmod command helps to define file permissions separately for user, group and others.

Linux SysAdmin: Use w and ps commands to find out what other users are doing

Written on June 28th, 2010 at 13:03 pm by chia

There are several utilities to find out what other logged in users are doing on a system, who is currently active, remote host one has used to login, what processes are they runnning and similar such info. In this howto, I will show you how to use 'w' and 'ps' commands to get such information. Such info comes in handy to a sysadmin.

How to force users to change their password upon first login?

Written on June 17th, 2010 at 14:41 pm by chia

In this tutorial we will force a new user to change the password upon first login. This is usually used by sysadmins. We will use a linux command 'chage' - which will change user password expiry information.