如何重写启动脚本

user=rootport=3306CmdPath=/opt/mysql/binpassword=xxxxxxxxxxbase_dir=/opt/mysqlinst_dir=/data/3306alive="00"sMysqld=0sMysqldSafe=0fSock=0fPID=0check_alive(){echo "running check_alive..."      if [ ps -ef | grep $port | grep -v grep | grep 'mysqld ' |awk '{print $2}' ];thenecho "Process mysqld is running!"sMysqld=1elseecho "Process mysqld is not running!"sMysqld=0       fi     if [  `ps -ef | grep 3306 | grep -v grep | grep 'mysqld_safe' |awk '{print $2}'` ];then         echo "Process mysqld_safe is running!"
        sMysqldSafe=1
 else 
    echo "Process mysqld_safe is not running!"
    sMysqldSafe=0
     fi

     if [ -e  ${inst_dir}/mysql.sock ];then
        echo "socked file exists!"
        fSock=1
 else 
    echo "socked file not exists!"
    fSock=0
     fi

     if [ -e  ${inst_dir}/mysql.pid ];then
        echo "pid file exists!"
        fPID=1
 else 
    echo "pid file  not exists!"
    fPID=0
     fi

     if [ $sMysqld -eq 1 ];then
        if [ $fPID -eq 0 ];then
            echo "PID is missing, tring to recreate..."
            ps -ef | grep $port | grep -v grep | grep 'mysqld ' |awk '{print $2}' > ${inst_dir}/mysql.pid
            if [ -e ${inst_dir}/mysql.pid ]; then
                echo "pid file is created!"
            else
                echo "can not create PID file, please have a check!"
            fi
        fi
        if [ $sMysqldSafe -eq 0 ];then
            echo "Process mysqld_safe is missing, please have a check! May cause mysqld crash!"
        fi
        if [ $fSock -eq 1 ];then
            echo "MySQL running fine!!!"
            alive="11"
        else
            echo "socket file is missing, you may have to login without socket!"
            alive="10"          
        fi                          
     else
        echo "process mysqld is missing, mysql is stopped!"
        if [ $fSock -eq 1 ] | [ $fPID -eq 1 ];then
            echo "mysql was stopped abnormality!"
            echo "cleaning socket file and pid file"
            alive="01"
        else
            alive="00"
    fi     fi}start_mysql(){   check_alive printf "MySQL is starting ... \n"if [ $alive == "00" ]; then${CmdPath}/mysqld_safe --defaults-file=${inst_dir}/my.cnf --user=${user} 2>&1 >/dev/null &elseif [  $alive == "11" ]; thenecho "MySQL is runnig!"elseif [ $alive == "01" ]; thenecho "MySQL was stopped but pid or sock file still exits!"echo "Cleanning pid or sock files!"if [ $fSock -eq 1 ];thenrm -f ${inst_dir}/mysql.sockfiif [ $fPID -eq 1 ];thenrm -f ${inst_dir}/mysql.pidfiecho "Tring to start MySQL again!!!"${CmdPath}/mysqld_safe --defaults-file=${inst_dir}/my.cnf --user=${user} 2>&1 >/dev/null &fififi}stop_mysql(){check_aliveprintf "MySQL is Stopping...\n" if [ $alive == "11" ]; then${CmdPath}/mysqladmin -u root -p${password} -S ${inst_dir}/mysql.sock shutdown 2>&1 >/dev/null &       elseif [ $alive == "10" ]; then${CmdPath}/mysqladmin -u root -p${password} -h $HOSTNAME -P $port --protocol tcp shutdown 2>&1 >/dev/null &elseecho "MySQL is not running, no need stop!" fi               fi}restart_mysql(){stop_mysqlsleep 5if [ $? == 0 ];thenstart_mysqlelseecho "stop mysql failed!"fi}case $1 instart)start_mysql;;stop)stop_mysql       ;;restart)restart_mysql;;status)status_mysql;;alive)check_alive;;*)printf "Please in put start|stop|restart|status as input";;esac}