diff --git a/nose/bin/echo.ts b/nose/bin/echo.ts
new file mode 100644
index 0000000..0e06a22
--- /dev/null
+++ b/nose/bin/echo.ts
@@ -0,0 +1,3 @@
+export default function (...args: string[]): string {
+  return args.join(" ")
+}
\ No newline at end of file
diff --git a/src/server.tsx b/src/server.tsx
index 0fe9753..85f611f 100644
--- a/src/server.tsx
+++ b/src/server.tsx
@@ -54,12 +54,12 @@ app.on("GET", ["/js/:path{.+}", "/shared/:path{.+}"], async c => {
 
 const wsConnections: any[] = []
 
-app.get("/ws", upgradeWebSocket((c) => {
+app.get("/ws", upgradeWebSocket(async c => {
     return {
         onOpen(_e, ws) {
             wsConnections.push(ws)
         },
-        onMessage(event, ws) {
+        async onMessage(event, ws) {
             let data: Message | undefined
 
             try {
@@ -72,7 +72,7 @@ app.get("/ws", upgradeWebSocket((c) => {
 
             if (!data) return
 
-            const result = runCommand(data.data as string)
+            const result = await runCommand(data.data as string)
             ws.send(JSON.stringify({ id: data.id, type: "output", data: result }))
         },
         onClose: () => console.log('Connection closed'),
diff --git a/src/shell.ts b/src/shell.ts
index 118e863..9fd75fa 100644
--- a/src/shell.ts
+++ b/src/shell.ts
@@ -2,8 +2,44 @@
 // runs commands and such.
 
 import type { CommandResult } from "./shared/types"
+import { join, resolve } from "path"
 import { NOSE_BIN } from "./config"
+import { isFile } from "./utils"
 
-export function runCommand(input: string): CommandResult {
-    return { status: "ok", output: "command: " + input }
+export async function runCommand(input: string): Promise<CommandResult> {
+    const [cmd = "", ...args] = input.split(" ")
+
+    if (!commandExists(cmd)) {
+        return { status: "error", output: `${cmd} not found` }
+    }
+
+    let status: "ok" | "error" = "ok"
+    let output = ""
+
+    try {
+        [status, output] = await exec(cmd, args)
+    } catch (err) {
+        status = "error"
+        output = err instanceof Error ? err.message : String(err)
+    }
+
+    console.log("cmd", cmd)
+    console.log("args", args)
+
+    return { status, output }
+}
+
+function commandExists(cmd: string): boolean {
+    return isFile(join(NOSE_BIN, cmd + ".ts"))
+}
+
+async function exec(cmd: string, args: string[]): Promise<["ok" | "error", string]> {
+    const path = join(NOSE_BIN, cmd + ".ts")
+    const module = await import(path + "?t+" + Date.now())
+
+    if (!module || !module.default) {
+        return ["error", `${cmd} has no default export`]
+    }
+
+    return ["ok", await module.default(...args)]
 }
\ No newline at end of file