PROJECT 01SYSTEMS PROGRAMMING
rsh.
A Unix-style shell. Written in Rust.
From a line of input to a running process. A custom shell built from scratch to work directly with command execution, process lifecycles, and the operating system.
REPL · Process piping · I/O redirection
# A shell, built from first principles.
rsh ❯ echo hello | cat
hello
rsh ❯ echo hello > greeting.txt
rsh ❯ cat < greeting.txt
hello
rsh ❯
ILLUSTRATIVE SESSION01Parse
02Spawn
03Pipe
04Execute
std::processPOSIX signals
Inside the engineeringExplore case studyClose case study+
THE BUILD
Bridging input and execution.
An interactive Read-Eval-Print Loop parses commands and executes them. Built-in commands, including cd and exit, sit alongside child-process spawning and environment-variable management.
ENGINEERING DETAILS
- Process managementUsed Rust’s
std::processto spawn and manage child processes. - Composable commandsImplemented pipes (
|) and input/output redirection (<,>) to chain commands. - Interrupt handlingManaged POSIX signals for stable foreground execution and graceful handling of user interrupts.