What is Unix?

Unix is a family of multitasking, multi-user operating systems created in the 1960s at Bell Labs.

Key features:

• Everything is a file: Uniform interface for accessing devices and resources.
• Use of pipelines: Ability to connect the output of one program to the input of another for complex tasks.
• Powerful set of command-line utilities: cat, grep, sed, awk, and others.
• Hierarchical file system.
• Portability: Ability to transfer to different hardware platforms.
• Process separation: Each process runs in its own address space.

Examples of Unix-based or Unix-like operating systems:

• Linux
• macOS
• FreeBSD
• Solaris

The architecture of a Unix system typically includes:

• Kernel: The core managing resources.
• Shell: Interface for user interaction with the kernel (Bash, Zsh, etc.).
• Utilities: A set of programs for performing tasks.