It might sound strange at first but i must say that it's very useful specially if you have shell scripts as part of your application. Usually For making this scripts as automated as possible there should be a way to reuse the application's configurations (ips, passwords , etc) and not having to update a separate configuration file whenever anything changes in the application. It's not limited only to this and can be used to pass any kind of variables.

Unfortunately there is no way to know that the email has been correctly delivered right after sending it. Therefore when someone send a message using Drupal's Contact form or any other modules, he may receive a "Successful message" but the site owner may never receive that message due to the wrong email address , network failure , mail server problem or blocking by spam protector.
This might cause some misunderstanding , loosing a great job opportunity or etc.

Writing smart programs using bash script is not easy, there are many issues along the way and one of them is what i'm going to describe here.

Sometimes it's require for bash scripts to know their location, for example when they are part of a package and there are other require files (on the same location) for them to run properly, and it's also not possible to change the path to where they're located simply because they also need the current directory.

Linux Kernel is the heart of the opensource movement, because it allows users to have a complete open source operating system. With every release it brings lots of cool new features to the Linux community. Although it's very important piece of software, propely the more important the any other software in open source community it's unknown to many users. The are two reasons for this.