如何实现hadoop启动脚本

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#!/bin/bash # The next lines are for chkconfig on RedHat systems.# chkconfig: 35 98 02# description: Starts and stops hadoop Server #autor:516249940@qq.com#date:2017-03-06  # The next lines are for chkconfig on SuSE systems.# /etc/init.d/xxx#### BEGIN INIT INFO# Provides: xxx# Required-Start: $network $syslog# Required-Stop:# Default-Start: 2 3 5# Default-Stop: 0 6# Short-Description: Starts and stops hadoop Server # Description: Starts and stops hadoop Server ### END INIT INFOHADOOP_SBIN="/usr/local/hadoop/sbin"  JAVA_ETC="/etc/alternatives"case $1 in    start)             $HADOOP_SBIN/start-dfs.sh                   $HADOOP_SBIN/start-yarn.sh                   $HADOOP_SBIN/mr-jobhistory-daemon.sh start historyserver                   echo "the hadoop is ok"           ;;   stop)             $HADOOP_SBIN/mr-jobhistory-daemon.sh stop historyserver                   $HADOOP_SBIN/stop-yarn.sh           $HADOOP_SBIN/stop-dfs.sh                   echo "the hadoop  is stop"           ;;   restart|reload|force-reload)            $HADOOP_SBIN/mr-jobhistory-daemon.sh stop historyserver                   $HADOOP_SBIN/stop-yarn.sh           $HADOOP_SBIN/stop-dfs.sh                   echo "the hadoop  is stop"                   sleep 3           $HADOOP_SBIN/start-dfs.sh                   $HADOOP_SBIN/start-yarn.sh                   $HADOOP_SBIN/mr-jobhistory-daemon.sh start historyserver                   echo "the hadoop is ok"                        ;;   status) # 查看状态需要做的步骤             $JAVA_ETC/jps             ;;   *) echo "$0 {start|stop|restart|status}"             exit 4             ;;esac

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