Initial commit

.gitignore

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+/target
+Cargo.lock

Cargo.toml

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+[package]
+name = "grsh"
+version = "0.1.0"
+authors = ["g1n <g1n@ttm.sh>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

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+use std::io::{self, stdout, Write};
+use std::env;
+use std::process::Command;
+use std::path::Path;
+
+fn main() {
+    loop {
+    print!("$ ");
+    io::stdout().flush();
+    
+    let mut input = String::new();
+    io::stdin().read_line(&mut input).unwrap();
+    
+    let mut parts = input.trim().split_whitespace();
+    let command = parts.next().unwrap();
+    let args = parts;
+
+    match command {
+        "cd" => {
+            let new_dir = args.peekable().peek().map_or("/", |x| *x);
+            let root = Path::new(new_dir);
+            if let Err(e) = env::set_current_dir(&root) {
+                eprintln!("{}", e);
+            }
+        },
+        "exit" => return,
+        command => {
+                let mut child = Command::new(command)
+                    .args(args)
+                    .spawn();
+
+                match child {
+                    Ok(mut child) => { child.wait(); },
+                    Err(e) => eprintln!("{}", e),
+                };
+        }
+    }
+    }
+}