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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.

In Drupal it's possible to overwrite and extend a theme using sub-themes! So i usually create a custom theme for my site as a sub-Theme of a base theme and try to put all the site specific stuff to that theme instead of the base theme, although it's tricky! and sometimes i have to spend hours finding a workaround for not completely implemented sub themming features but i think it worth it.

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.

Sometimes the code is forward compatible, for example when it's compatible with all future PHP5 releases, put PHP's version_compare function does not support this (Perhaps because they know that they always break compatibility with every minor release!!!). This function supports .x, for the above example it's : 5.x

It's also shared here