A Unix-like kernel for x86-64. Pipes, signals, virtual terminals, job control. Boots in QEMU.

What It Does

Pipes work: ps | grep shell. File system is RAM-based with VFS. Signals handle Ctrl+C properly. Four virtual terminals via Alt+F1-F4. Background jobs with &. I/O redirection. Command history and tab completion.

Under the Hood

64-bit long mode with 4-level paging. Preemptive multitasking via timer-based scheduler. Linux-style syscalls (18+). Per-process virtual memory and file descriptors. Ring 0/3 separation.

Demo

# Start the enhanced shell
$ /bin/shell_v2

# Pipe example - filter process list
$ ps | grep shell
2    1    RUN      shell_v2

# File operations
$ echo "Hello SimpleOS" > test.txt
$ cat test.txt
Hello SimpleOS
$ ls
hello.txt
readme.txt
test.txt

# Background jobs
$ stress &
[1] 25
$ jobs
[1]  Running    stress &
$ fg 1

# Virtual terminals
Press Alt+F2    # Switch to terminal 2
Press Alt+F1    # Back to terminal 1

# Tab completion
$ he<TAB>       # Completes to "help"
$ e<TAB>        # Shows: echo exit

# Signal handling
$ stress
Press Ctrl+C    # Interrupt the process

Build

Requires x86_64-elf-gcc cross-compiler, xorriso, and QEMU.

make      # Build ISO
make run  # Boot in QEMU

Syscalls

Process: fork, exec, exit, wait, getpid, ps I/O: read, write, open, close, pipe, dup2 FS: stat, mkdir, readdir Memory: sbrk Other: sleep, kill