diff --git a/src/main/java/com/github/hcsp/shell/Fork.java b/src/main/java/com/github/hcsp/shell/Fork.java
index 28e0700..39f6b1c 100644
--- a/src/main/java/com/github/hcsp/shell/Fork.java
+++ b/src/main/java/com/github/hcsp/shell/Fork.java
@@ -3,6 +3,8 @@
 import java.io.File;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.HashMap;
+import java.util.Map;
 
 public class Fork {
     public static void main(String[] args) throws Exception {
@@ -10,6 +12,12 @@ public static void main(String[] args) throws Exception {
         // 工作目录是项目目录下的working-directory目录（可以用getWorkingDir()方法得到这个目录对应的File对象）
         // 传递的命令是sh run.sh
         // 环境变量是AAA=123
+        ProcessBuilder pb =new ProcessBuilder("sh","run.sh");
+        pb.directory(getWorkingDir());
+        Map<String, String> environment = pb.environment();
+        environment.put("AAA","123");
+        pb.redirectOutput(getOutputFile());
+        pb.start().waitFor();
     }
 
     private static File getWorkingDir() {
diff --git a/working-directory/output.txt b/working-directory/output.txt
index e69de29..8b13789 100644
--- a/working-directory/output.txt
+++ b/working-directory/output.txt
@@ -0,0 +1 @@
+