Shadow OS v1.0.0 — Initial Release

Shadow OS v1.0.0

A minimal experimental operating system written in C and x86 Assembly.
Boots via GRUB from a bootable ISO image and runs inside QEMU or VirtualBox.

Features

• Bootloader written in x86 Assembly (NASM)
• Kernel implemented in C (32-bit, freestanding)
• Interactive command-line interface
• File system simulation (create, write, read, remove, list)
• 12 built-in commands: clear, pwd, echo, create, write,
  read, remove, list, time, date, help, exit
• GRUB-based bootable ISO
• Persistent disk image support via QEMU

Build Stack

• NASM assembler
• i686-linux-gnu-gcc cross compiler
• GRUB bootloader tools
• QEMU / VirtualBox for virtualization

Run

qemu-system-i386 -cdrom myos.iso -drive file=persistent.img,format=raw -m 512M