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Feb 1, 2026
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This PR builds out a functional Unix-like userspace by implementing core file utilities (cat, touch, mkdir, rmdir, rm), system tools (mount, insmod, rmmod, time), and a significantly enhanced shell with builtins (cd, pwd, export, env, echo, reboot), environment variable support, and PATH-based command resolution. The shell now properly forks and executes external programs, making it a real interactive environment rather than just a command dispatcher. Added essential libc functionality including malloc/free memory allocation using sbrk, atoi for string parsing, and strchr for string manipulation, along with syscall wrappers for all the file operations, module management, and system control functions these tools require. Moved fcntl.h and other shared definitions to the uapi boundary for proper kernel-userspace separation, added the brk syscall (currently stubbed) to support future heap management, implemented the reboot syscall with magic number validation and permission checks, and changed time_t from unsigned to signed long to match POSIX conventions and avoid year 2038 issues on 32-bit systems.