Linux Basics

Foundational Linux and Unix notes covering filesystems, permissions, installation, and core concepts.

Java Programming on Linux: Compile and Run a Simple Program

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Java programs can be compiled and run from the Linux command line using the JDK tools javac and java. Check Java is installed If javac is missing, install a JDK package rather than only a runtime package. Compile a Java file This creates a compiled Hello.class file. Run the program Use the class name without … Read more

Understanding chmod and Linux File Permissions

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chmod changes file and directory permissions in Linux. It is useful when a script cannot execute, a file is too open, or a service needs access to a path. Make a script executable This adds execute permission for the file owner only. Common numeric permissions 644: owner can read/write, others can read 755: owner can … Read more

Introduction to Linux: Practical Basics

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Linux is a Unix-like operating system used on servers, desktops, cloud platforms, embedded systems, and development environments. The quickest way to become comfortable with it is to learn the filesystem, shell, permissions, processes, packages, and networking basics. Start with the shell pwd ls -la cd /path cp source destination mv old new rm file Understand … Read more