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使用Java代码fork子进程 #196

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使用Java代码fork子进程 #196

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8 changes: 8 additions & 0 deletions src/main/java/com/github/hcsp/shell/Fork.java
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Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,21 @@
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 {
// 请在这里使用Java代码fork一个子进程，将fork的子进程的标准输出重定向到指定文件：工作目录下名为output.txt的文件
// 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 p = new ProcessBuilder("sh", "run.sh");
p.directory(getWorkingDir());
Map<String, String> envs = p.environment();
envs.put("AAA", "123");
p.redirectOutput(getOutputFile());
p.start().waitFor();
}

private static File getWorkingDir() {
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7 changes: 7 additions & 0 deletions working-directory/output.txt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
AAA is: 123
total 40
-rw-r--r-- 1 a staff 12B Oct 20 08:44 output.txt
drwxr-xr-x 12 a staff 384B Oct 20 08:44 ..
-rw-r--r-- 1 a staff 47B Oct 19 17:33 run.sh
drwxr-xr-x 5 a staff 160B Oct 19 17:33 .
-rw-r--r-- 1 a staff 11K Oct 19 17:33 .hidden.txt