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Environment Variables In Linux, Environment variables are named key-value pairs that store information about your operating environment and configuration. They are crucial because they let the operating system, applications, and scripts know about elements such as : Where programs are location; _via _PATH. Your user/currently logged-in directory; HOME. Language or locale settings. System-wide or app-specific configurations. In simple terms, environment variables are a foundational way that Linux customizes, configues, and manages the actions of programs and users through simple “key=value” pairs. ...

Use mail to send or receive stored messages & system notificaitons, wall to broadcast announcements to all users and use write for quick direct messages to another user.

Regular Expression Regular expression is a method of pattern matching. It allows you to define patterns of texts and search for it in other texts, no matter the complexity or the amount of text there is to process. Using regular expression is considered a more efficient solution, when there’s complexity in searching for a text that you want to find. It is also called as regex. Keep in mind that regular expression is supported in almost every programming language. If you were to face a situation when there’s complexity in searching a text, take a look at how the systax looks like other programming languages and utilize them. ...

Detailed explanation of Debian packaging file structure.

Detailed explanation of RPM package file structure.

The tar command (short for tape archive) is a foundational tool in Linux for archiving and compressing files and directories

Read and preview file contents using commands like cat, head, tail, less.

Focuses on shaping, refining, or deduplicating data using cut, sort, uniq commands.

Create a simple “Hello World” C program, prepare necessary Debian packaging files (debian/) build the .deb pacakge, install it to test and remvoe it.

Create a simple “Hello World” C program, write a .spec file, build an RPM package with rpmbuild, install it to test, and then remove it.