diff --git a/packages/shim-deno/src/deno/stable/classes.ts b/packages/shim-deno/src/deno/stable/classes.ts
index 0f63d60..03e3608 100644
--- a/packages/shim-deno/src/deno/stable/classes.ts
+++ b/packages/shim-deno/src/deno/stable/classes.ts
@@ -1,3 +1,4 @@
+export { Command } from "./classes/Command.js";
 export { File, FsFile } from "./classes/FsFile.js";
 export { Permissions } from "./classes/Permissions.js";
 export { PermissionStatus } from "./classes/PermissionStatus.js";
diff --git a/packages/shim-deno/src/deno/stable/classes/Command.ts b/packages/shim-deno/src/deno/stable/classes/Command.ts
new file mode 100644
index 0000000..2ef5cef
--- /dev/null
+++ b/packages/shim-deno/src/deno/stable/classes/Command.ts
@@ -0,0 +1,188 @@
+///<reference path="../lib.deno.d.ts" />
+
+import childProcess from "child_process";
+import fs from "fs";
+import os from "os";
+import url from "url";
+import { once } from "events";
+import which from "which";
+
+import { BufferStreamReader } from "../../internal/streams.js";
+import * as errors from "../variables/errors.js";
+
+type SignalName = keyof typeof os.constants.signals;
+
+function getCmd(firstArg: string | URL) {
+  if (firstArg instanceof URL) {
+    return url.fileURLToPath(firstArg);
+  } else {
+    return firstArg;
+  }
+}
+
+function getEnv(options: Deno.CommandOptions) {
+  const env = options.env ?? {};
+  for (const name in process.env) {
+    if (!Object.prototype.hasOwnProperty.call(env, name)) {
+      if (options.clearEnv) {
+        if (os.platform() === "win32") {
+          env[name] = "";
+        } else {
+          delete env[name];
+        }
+      } else {
+        env[name] = process.env[name]!;
+      }
+    }
+  }
+  return env;
+}
+
+function getStdio(
+  value: Deno.CommandOptions["stdout"] | undefined,
+): childProcess.StdioPipe | childProcess.StdioNull {
+  if (value === "inherit" || value == null) {
+    return "inherit" as const; // default
+  } else if (value === "piped") {
+    return "pipe" as const;
+  } else if (value === "null") {
+    return "ignore" as const;
+  } else {
+    throw new Error("Unknown value.");
+  }
+}
+
+function parseCommandStatus(
+  statusCode: number | null,
+  signalName: NodeJS.Signals | null,
+): Deno.CommandStatus {
+  if (!statusCode && !signalName) {
+    return { success: false, code: 1, signal: null };
+  }
+
+  // when there is a signal, the exit code is 128 + signal code
+  const signal = signalName
+    ? os.constants.signals[signalName]
+    : statusCode != null && statusCode > 128
+    ? statusCode - 128
+    : undefined;
+
+  // default to 1 if code can not be determined
+  const code = statusCode != null
+    ? statusCode
+    : signal != null
+    ? 128 + signal
+    : 1;
+  const success = code === 0;
+
+  return { success, code, signal: signalName as Deno.Signal | null };
+}
+
+export class Command implements Deno.Command {
+  constructor(
+    readonly command: string | URL,
+    readonly options: Deno.CommandOptions = {},
+  ) {}
+
+  async output(): Promise<Deno.CommandOutput> {
+    if (this.options.cwd && !fs.existsSync(this.options.cwd)) {
+      throw new errors.NotFound("No such file or directory.");
+    }
+
+    // childProcess.spawn will asynchronously check if the command exists, but
+    // we need to do this synchronously
+    const commandName = getCmd(this.command);
+    if (!which.sync(commandName, { nothrow: true })) {
+      throw new errors.NotFound("No such file or directory");
+    }
+
+    const cp = childProcess.spawn(commandName, this.options.args || [], {
+      cwd: this.options.cwd,
+      env: getEnv(this.options),
+      uid: this.options.uid,
+      gid: this.options.gid,
+      shell: false,
+      windowsVerbatimArguments: this.options.windowsRawArguments,
+      signal: this.options.signal,
+      stdio: [
+        getStdio(this.options.stdin),
+        getStdio(this.options.stdout),
+        getStdio(this.options.stderr),
+      ],
+    });
+
+    const status = await once(cp, "exit");
+
+    const stdout = cp.stdout
+      ? await new BufferStreamReader(cp.stdout).readAll()
+      : new Uint8Array();
+    const stderr = cp.stderr
+      ? await new BufferStreamReader(cp.stderr).readAll()
+      : new Uint8Array();
+
+    const [statusCode, signalName] = status as [
+      number,
+      SignalName | null,
+    ];
+
+    const commandStatus = parseCommandStatus(statusCode, signalName);
+
+    const out: Deno.CommandOutput = {
+      stdout: stdout,
+      stderr: stderr,
+      ...commandStatus,
+    };
+
+    return out;
+  }
+
+  outputSync(): Deno.CommandOutput {
+    if (this.options.cwd && !fs.existsSync(this.options.cwd)) {
+      throw new errors.NotFound("No such file or directory.");
+    }
+
+    // childProcess.spawn will asynchronously check if the command exists, but
+    // we need to do this synchronously
+    const commandName = getCmd(this.command);
+    if (!which.sync(commandName, { nothrow: true })) {
+      throw new errors.NotFound("No such file or directory");
+    }
+
+    const cp = childProcess.spawnSync(
+      commandName,
+      {
+        cwd: this.options.cwd,
+        env: getEnv(this.options),
+        uid: this.options.uid,
+        gid: this.options.gid,
+        windowsVerbatimArguments: this.options.windowsRawArguments,
+        signal: this.options.signal,
+        stdio: [
+          getStdio(this.options.stdin),
+          getStdio(this.options.stdout),
+          getStdio(this.options.stderr),
+        ],
+      },
+    );
+
+    const stdout = new Uint8Array(cp.stdout);
+    const stderr = new Uint8Array(cp.stderr);
+
+    const commandStatus = parseCommandStatus(
+      cp.status,
+      cp.signal,
+    );
+
+    const out: Deno.CommandOutput = {
+      stdout: stdout,
+      stderr: stderr,
+      ...commandStatus,
+    };
+
+    return out;
+  }
+
+  spawn(): Deno.ChildProcess {
+    throw new Error("Not implemented");
+  }
+}
diff --git a/packages/shim-deno/src/deno/stable/types.ts b/packages/shim-deno/src/deno/stable/types.ts
index 20c1270..80a221b 100644
--- a/packages/shim-deno/src/deno/stable/types.ts
+++ b/packages/shim-deno/src/deno/stable/types.ts
@@ -4,6 +4,10 @@ export type Closer = Deno.Closer;
 export type Conn = Deno.Conn;
 export type ConnectOptions = Deno.ConnectOptions;
 export type ConnectTlsOptions = Deno.ConnectTlsOptions;
+export type CommandOptions = Deno.CommandOptions;
+export type CommandOutput = Deno.CommandOutput;
+export type CommandStatus = Deno.CommandStatus;
+export type ChildProcess = Deno.ChildProcess;
 export type DenoTest = Deno.DenoTest;
 export type DirEntry = Deno.DirEntry;
 export type EnvPermissionDescriptor = Deno.EnvPermissionDescriptor;