package cn.shell;

import java.io.IOException;

import org.apache.hadoop.util.Shell;

public class ShellDemo {

    public static void main(String[] args) throws IOException {

        String pars="ipconfig";

        String out=Shell.ShellCommandExecutor.execCommand(pars);

        System.out.println(out);

    }

}

    public static boolean hasAppBeSubmited(String queueName){

        boolean tag=false;

        try {

            String out=Shell.ShellCommandExecutor.execCommand("yarn", "application", "-list");

            String[] apps =out.split("Tracking-URL");

            if(apps.length ==2) {

                tag = apps[1].contains(queueName);

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

        return tag;

    }

Shell.ShellCommandExecutor.execCommand("sh", "-c","hadoop fs -text hdfs文件  >  本地文件");

注意如果直接执行命令
Shell.ShellCommandExecutor.execCommand("hadoop", "fs", "-text","hdfs文件路径",">" "本地文件");
会报错，会把">"符号当作文件路径处理。所以需要sh -c "命令参数" 讲命令行当作整体传入

Shell.ShellCommandExecutor.execCommand("split","-l", "10000", "--numeric-suffixes=1","--suffix-length=3", "--additional-suffix=.txt",srcFile,newFile);　　

Shell.ShellCommandExecutor.execCommand("./ftp.sh",ftpHost,ftpPort,user,password,putPath+File.separator+date,fileDir);