diff --git a/src/main/java/com/github/hcsp/shell/Fork.java b/src/main/java/com/github/hcsp/shell/Fork.java
index 28e0700..3b749d3 100644
--- a/src/main/java/com/github/hcsp/shell/Fork.java
+++ b/src/main/java/com/github/hcsp/shell/Fork.java
@@ -3,6 +3,7 @@
 import java.io.File;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.Map;
 
 public class Fork {
     public static void main(String[] args) throws Exception {
@@ -10,6 +11,13 @@ 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> envs = pb.environment();
+        envs.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..8368593 100644
--- a/working-directory/output.txt
+++ b/working-directory/output.txt
@@ -0,0 +1,7 @@
+AAA is: 123
+total 18K
+-rw-r--r-- 1 胡凯波 197609  12  8月 16 12:47 output.txt
+drwxr-xr-x 1 胡凯波 197609   0  8月 16 12:46 ..
+-rwxr-xr-x 1 胡凯波 197609  50  8月 16 12:33 run.sh
+drwxr-xr-x 1 胡凯波 197609   0  8月 16 12:33 .
+-rw-r--r-- 1 胡凯波 197609 11K  8月 16 12:33 .hidden.txt