进程管理

系统管理员 2022-12-02 12:21 142阅读 0赞

## 一 进程相关概念      ##

进程：数据处理，管理数据，对数据进行计算。独占资源，数据处理，一个进程可以有多个线程，也可以没有；

线程：依附于进程运行，也是处理数据。线程之间共享资源；一个线程中不能有进程，而且线程中不允许有线程；可以启动多个线程，但每次执行的结果不一样

## 二 查看进程相关命令 ##

### 1.ps ###

[root@client01 ~]# ps
     PIDTTY          TIME CMD
     1157pts/0    00:00:00 bash
     1600pts/0    00:00:00 ps
    #ps -ef包括的进程有：前台进程、后台进程、多个终端运行的进程
    [root@client01 ~]# ps -ef
     
    UID       PID  PPID  C STIME TTY          TIME CMD
    root        1     0  0 16:49 ?        00:00:00 /sbin/init
     
    #UID：用户编号
    #PID：进程编号
    #PPID：父进程编号
    #STIME：开始启动时间
    #TTY：?表示后台进程
    #TIME：占用CPU的时间
    #CMD：启动的命令
    #[]：后台进程
     
    [root@client01 ~]# ps -aux
    USER      PID %CPU %MEM    VSZ  RSS TTY      STAT START   TIME COMMAND
    root        1  0.0  0.3 19204  1484 ?        Ss  16:49   0:00 /sbin/init
     
    #每一列代表什么意思可以通过man手册到
     
    #init：该进程不能杀死

### 2.top：动态显示进程的所有信息 ###

top - 19:37:19 up  2:47, 1 user,  load average: 0.00, 0.00,0.00
    Tasks: 73 total,   1 running,  72 sleeping,  0 stopped,   0 zombie
    Cpu(s): 0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa, 0.0%hi,  0.0%si,  0.0%st
    Mem:   384996k total,   148672kused,   236324k free,    10564k buffers
    Swap: 1048568k total,        0kused,  1048568k free,    49440k cached
     
    #僵尸进程：子进程死掉，父进程并不知道。父进程仍然分配资源，会对系统资源进行浪费。不能杀死。处理：重启系统
     
    #孤儿进程：父进程死掉，子进程就成了孤儿进程。不用管理。上一级进程进行管理（一般是init）。
     
    #buffer（主要在内存中）：主要解决速率不匹配问题，磁盘和内存之间的缓冲区
    #cache（主要在CPU中）：主要解决速率不匹配问题，CPU和内存的数据缓冲区

## 三 启动和关闭进程 ##

#启动一个进程
    [root@client01 ~]# /etc/init.d/postfixstart
    [root@client01 ~]# /etc/init.d/postfix stop
    Shutting down postfix:                                     [  OK  ]
    [root@client01 ~]# service postfix start
    Starting postfix:                                         [  OK  ]
    [root@client01 ~]# service postfix stop
    Shutting down postfix:                                     [  OK  ]
    [root@client01 ~]# service postfix restart
    Shutting down postfix:                                     [  OK  ]
    Starting postfix:                                         [  OK  ]
    [root@client01 ~]# ps -ef|grep postfix
    root     2145     1  0 13:34 ?        00:00:00 /usr/libexec/postfix/master
    postfix  2147  2145  0 13:34 ?        00:00:00 pickup -l -t fifo -u
    postfix  2148  2145  0 13:34 ?        00:00:00 qmgr -l -t fifo -u
    root     2150  1157  0 13:34 pts/0    00:00:00 grep postfix
     
    #安装httpd服务器
    [root@client01 ~]# yum install httpd -y
    [root@client01 ~]# /etc/init.d/httpd start
    Starting httpd: httpd:apr_sockaddr_info_get() failed for client01.host.com
    httpd: Could not reliably determine theserver's fully qualified domain name, using 127.0.0.1 for ServerName
                                                               [  OK  ]
    [root@client01 ~]# /etc/init.d/httpd stop
    Stopping httpd:                                           [  OK  ]
    [root@client01 ~]# /etc/init.d/httpd start
    Starting httpd: httpd:apr_sockaddr_info_get() failed for client01.host.com
    httpd: Could not reliably determine theserver's fully qualified domain name, using 127.0.0.1 for ServerName
                                                              [  OK  ]
    [root@client01 ~]# ps -ef|grep httpd
    root     2203     1  0 13:35 ?       00:00:00 /usr/sbin/httpd
    apache   2205  2203  0 13:35 ?        00:00:00 /usr/sbin/httpd
    apache   2206  2203  0 13:35 ?        00:00:00 /usr/sbin/httpd
    apache   2207  2203  0 13:35 ?        00:00:00 /usr/sbin/httpd
    apache   2208  2203  0 13:35 ?       00:00:00 /usr/sbin/httpd
    apache   2209  2203  0 13:35 ?        00:00:00 /usr/sbin/httpd
    apache   2210  2203  0 13:35 ?        00:00:00 /usr/sbin/httpd
    apache   2211  2203  0 13:35 ?        00:00:00 /usr/sbin/httpd
    apache   2212  2203  0 13:35 ?       00:00:00 /usr/sbin/httpd
    root     2214  1157  0 13:35 pts/0    00:00:00 grep httpd
     
    [root@client01 ~]# /etc/init.d/httpd stop
    Stopping httpd:                                           [  OK  ]
    [root@client01 ~]# ps -ef|grep httpd
    root     2222  1157  0 13:37 pts/0    00:00:00 grep httpd
     
     
    #关闭一个进程
     
    #一个服务：多个进程组成
     
    #模拟孤儿进程
     
    #kill 杀死进程
    [root@client01 ~]# /etc/init.d/httpd start
    Starting httpd:
    [root@client01 ~]# ps -ef|grep httpd
    root     2228     1  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2230  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2231  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2232  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2233  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2234  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2235  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2236  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    apache   2237  2228  0 13:38 ?        00:00:00 /usr/sbin/httpd
    root     2250  1157  0 13:40 pts/0    00:00:00 grep httpd
    #杀掉后，再次查询，没有该服务
    [root@client01 ~]# kill 2228
    [root@client01 ~]# ps -ef|grep httpd
    root     2252  1157  0 13:40 pts/0    00:00:00 grep httpd
     
    #模拟孤儿进程
    [root@client01 ~]# /etc/init.d/httpd start
    Starting httpd: httpd:apr_sockaddr_info_get() failed for client01.host.com
    httpd: Could not reliably determine theserver's fully qualified domain name, using 127.0.0.1 for ServerName
                                                              [  OK  ]
    [root@client01 ~]# ps -ef|grep httpd
    root     2258     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2260  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2261  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2262  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2263  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2264  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2265  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2266  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2267  2258  0 13:41 ?        00:00:00 /usr/sbin/httpd
    root     2269  1157  0 13:41 pts/0    00:00:00 grep httpd
     
    #强制杀死
    [root@client01 ~]# kill -9 2258
    [root@client01 ~]# ps -ef|grep httpd
    apache   2260     1  0 13:41 ?       00:00:00 /usr/sbin/httpd
    apache   2261     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2262     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2263     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2264     1  0 13:41 ?       00:00:00 /usr/sbin/httpd
    apache   2265     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2266     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2267     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    root     2271  1157  0 13:41 pts/0   00:00:00 grep httpd
     
    #访问：可以正常浏览器访问，说明服务正常，但是以后是否能访问就不一定，这些进程过一段会自动回收
    [root@larrywen ule-sa1]# firefox
    http://192.168.1.11/
     
     
    [root@client01 ~]# /etc/init.d/httpdrestart
    Stopping httpd:                                           [FAILED]
    Starting httpd: httpd:apr_sockaddr_info_get() failed for client01.host.com
    httpd: Could not reliably determine theserver's fully qualified domain name, using 127.0.0.1 for ServerName
    (98)Address already in use: make_sock:could not bind to address [::]:80
    (98)Address already in use: make_sock:could not bind to address 0.0.0.0:80
    no listening sockets available, shuttingdown
    Unable to open logs
                                                              [FAILED]
    [root@client01 ~]# ps -ef|grep httpd
    apache   2260     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2261     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2262     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2263     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2264     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2265     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2266     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2267     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    root     2326  1157  0 13:45 pts/0    00:00:00 grep httpd
     
    [root@client01 ~]# kill 2260
    [root@client01 ~]# ps -ef|grep httpd
    apache   2261     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2262     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2263     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2264     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2265     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2266     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    apache   2267     1  0 13:41 ?        00:00:00 /usr/sbin/httpd
    root     2328  1157  0 13:45 pts/0    00:00:00 grep httpd
    #正则匹配，全部杀死
    [root@client01 ~]# pkill httpd
    [root@client01 ~]# ps -ef|grep httpd
    root     2331  1157  0 13:45 pts/0    00:00:00 grep httpd
     
    [root@client01 ~]# /etc/init.d/httpd start
    Starting httpd: httpd:apr_sockaddr_info_get() failed for client01.host.com
    httpd: Could not reliably determine theserver's fully qualified domain name, using 127.0.0.1 for ServerName
                                                              [  OK  ]
    [root@client01 ~]# ps -ef|grep httpd
    root     2337     1  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2339  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2340  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2341  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2342  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2343  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2344  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2345  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    apache   2346  2337  0 13:47 ?        00:00:00 /usr/sbin/httpd
    root     2348  1157  0 13:48 pts/0    00:00:00 grep httpd
    #要查清楚，强制杀：很危险
    [root@client01 ~]# pkill -9 httpd
    [root@client01 ~]# ps -ef|grep httpd
    root     2351  1157  0 13:48 pts/0    00:00:00 grep httpd
     
    #列出所有的信号量
    [root@client01 ~]# kill -l
     1)SIGHUP   2) SIGINT    3) SIGQUIT 4) SIGILL     5) SIGTRAP
     6)SIGABRT 7) SIGBUS   8) SIGFPE    9) SIGKILL   10) SIGUSR1
    11) SIGSEGV 12)SIGUSR2 13) SIGPIPE   14) SIGALRM       15) SIGTERM
    16) SIGSTKFLT      17) SIGCHLD 18) SIGCONT       19) SIGSTOP 20) SIGTSTP
    21) SIGTTIN  22)SIGTTOU       23) SIGURG  24) SIGXCPU 25)SIGXFSZ
    26) SIGVTALRM   27) SIGPROF 28) SIGWINCH     29) SIGIO      30)SIGPWR
    31) SIGSYS    34)SIGRTMIN     35) SIGRTMIN+1 36) SIGRTMIN+2 37)SIGRTMIN+3
    38) SIGRTMIN+4 39) SIGRTMIN+5 40) SIGRTMIN+6 41) SIGRTMIN+7 42)SIGRTMIN+8
    43) SIGRTMIN+9 44) SIGRTMIN+10      45)SIGRTMIN+11      46) SIGRTMIN+12      47) SIGRTMIN+13
    48) SIGRTMIN+14      49) SIGRTMIN+15      50)SIGRTMAX-14      51) SIGRTMAX-13      52) SIGRTMAX-12
    53) SIGRTMAX-11      54) SIGRTMAX-10      55)SIGRTMAX-9 56) SIGRTMAX-8 57) SIGRTMAX-7
    58) SIGRTMAX-6 59) SIGRTMAX-5 60) SIGRTMAX-4 61) SIGRTMAX-3 62)SIGRTMAX-2
    63) SIGRTMAX-1 64) SIGRTMAX    
     
    #使用killall命令（启动的服务名字，不能通配使用）。建议使用，避免误杀（因为其他服务有可能重名）
    [root@client01 ~]# /etc/init.d/httpd start
    Starting httpd: httpd:apr_sockaddr_info_get() failed for client01.host.com
    httpd: Could not reliably determine theserver's fully qualified domain name, using 127.0.0.1 for ServerName
                                                               [  OK  ]
    [root@client01 ~]# ps -ef|grep http
    root     2366     1  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2368  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2369  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2370  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2371  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2372  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2373  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2374  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    apache   2375  2366  0 13:52 ?        00:00:00 /usr/sbin/httpd
    root     2377  1157  0 13:53 pts/0    00:00:00 grep http
    [root@client01 ~]# killall httpd
    [root@client01 ~]# ps -ef|grep http
    root     2380  1157  0 13:53 pts/0    00:00:00 grep http
    [root@client01 ~]# /etc/init.d/httpd start
    Starting httpd: httpd:apr_sockaddr_info_get() failed for client01.host.com
    httpd: Could not reliably determine theserver's fully qualified domain name, using 127.0.0.1 for ServerName
                                                              [  OK  ]
    [root@client01 ~]##xkill命令
     killall http
     
    #xkill命令（点谁谁死）
    [root@larrywen Desktop]# yum install xkill-y
    [root@larrywen Desktop]# xkill
    Select the window whose client you wish tokill with button 1....
     
    #保存top的信息然后用于分析
    [root@client01 ~]# top -b -n 2 > top.txt

## 四 前台进程和后台进程 ##

#前台进程
    [root@client01 ~]# find / -name"aaaaa"
    [root@client01 ~]# vim aa01.txt
     
    #后台进程
    [root@client01 ~]# vim aa01.txt
     
    [1]+ Stopped                 vimaa01.txt
    [root@client01 ~]# ps -ef|grep vim
    root     2561  2426  0 14:09 pts/0    00:00:00 vim aa01.txt
    root     2563  2426  0 14:09 pts/0    00:00:00 grep vim
    [root@client01 ~]# vim aa02.txt
     
    [2]+ Stopped                 vimaa02.txt
    [root@client01 ~]# vim aa03.txt
     
    [3]+ Stopped                 vimaa03.txt
    #查看任务
    [root@client01 ~]# jobs
    [1]  Stopped                 vimaa01.txt
    [2]- Stopped                 vimaa02.txt
    [3]+ Stopped                 vimaa03.txt
     
    #按Ctrl+Z将进程停止，可以发现拷贝的文件大小不变
    [root@larrywen opt]# cp -i/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./
    ^Z
    [1]+ Stopped                 cp -i -i/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./
    [root@larrywen opt]# ll rhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 163512320 Aug  5 14:13 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 163512320 Aug  5 14:13 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# jobs
    [1]+ Stopped                 cp -i -i/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./
     
    #放到后台执行 bg加编号
    [root@larrywen opt]# bg %1
    [1]+ cp -i -i/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./ &
    [root@larrywen opt]# ll rhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 487411712 Aug  5 14:13 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 683212800 Aug  5 14:13 rhel-server-6.1-x86_64-dvd.iso
     
     
    [root@client01 ~]# bg %1
    [1] vim aa01.txt &
    #放到前台执行
    [root@client01 ~]# fg %1
    vim aa01.txt
    [root@client01 ~]# jobs
    [2]- Stopped                 vimaa02.txt
    [3]+ Stopped                 vimaa03.txt
     
    #放到后台执行
    [root@larrywen opt]# cp /home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso./ &
    [1] 12611
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 1289060352 Aug  5 14:16 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 1392214016 Aug  5 14:16 rhel-server-6.1-x86_64-dvd.iso
     
    [1]+ Done                    cp -i/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./
     
    [root@larrywen opt]# cp/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./ &
    [1] 12647
    [root@larrywen opt]# jobs
    [1]+ Running                 cp -i/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./ &
    #Ctrl+C：中断，可以发现文件大小不变
    [root@larrywen opt]# fg %1
    cp -i/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso ./
    ^C
    [root@larrywen opt]# jobs
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 2298707968 Aug  5 14:17 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 2298707968 Aug  5 14:17 rhel-server-6.1-x86_64-dvd.iso
     
    [root@client01 ~]# jobs
    [2]- Stopped                 vimaa02.txt
    [3]+ Stopped                 vimaa03.txt
    [root@client01 ~]# kill %2
     
    [2]- Stopped                 vimaa02.txt
    [root@client01 ~]# jobs
    [2]+ Stopped                 vim aa02.txt
    [3]- Stopped                 vimaa03.txt
    [root@client01 ~]# kill -9 %2
     
    [2]+ Stopped                 vimaa02.txt
    [root@client01 ~]# jobs
    [2]+ Killed                  vimaa02.txt
    [3]- Stopped                 vimaa03.txt
     
    [root@client01 ~]# jobs
    [3]+ Stopped                 vimaa03.txt
    [root@client01 ~]# kill -9 %3
     
    [3]+ Stopped                 vimaa03.txt
    [root@client01 ~]# jobs
    [3]+ Killed                  vimaa03.txt
    [root@client01 ~]# jobs
     
    #后台执行
    [root@client01 ~]# cp rhel.iso /opt/ &
     
    [root@client01 ~]# nohup cp rhel.iso /opt/
     
    #拷贝的时候关闭终端
    [root@larrywen Desktop]# scp/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso 192.168.1.11:/root
    #文件大小不变
    [root@client01 ~]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 171425792 Aug  5 14:33 rhel-server-6.1-x86_64-dvd.iso
    [root@client01 ~]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 171425792 Aug  5 14:33 rhel-server-6.1-x86_64-dvd.iso
    [root@client01 ~]# llrhel-server-6.1-x86_64-dvd.iso
    [root@client01 ~]# rm -frhel-server-6.1-x86_64-dvd.iso
     
    #后台执行，&，关闭终端后仍然在拷贝
    [root@larrywen opt]# cp/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso /opt &
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 3600812032 Aug  5 14:38 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 3600812032 Aug  5 14:38 rhel-server-6.1-x86_64-dvd.iso
     
    #后台执行，nohup，关闭终端后仍然在拷贝
    [root@larrywen opt]# nohup cp/home/Wentasy/software/rhel-server-6.1-x86_64-dvd.iso /opt
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 2561306624 Aug  5 14:40 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso
    -rwxr-xr-x. 1 root root 2665922560 Aug  5 14:40 rhel-server-6.1-x86_64-dvd.iso
    [root@larrywen opt]# llrhel-server-6.1-x86_64-dvd.iso

>     我的邮箱：wgbno27@163.com   新浪微博：@Wentasy27         
>       微信公众平台：JustOracle（微信号：justoracle）
>       数据库技术交流群：336882565（加群时验证 From CSDN XXX）
>       Oracle交流讨论组：https://groups.google.com/d/forum/justoracle
>       By Larry Wen

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   <td style="text-align:right; font-family:microsoft yahei; color:white; font-size:12px"> <a title="我的CSDN博客——HelloWorld" href="http://blog.csdn.net/Wentasy" rel="nofollow">@Wentasy</a> 博文仅供参考，欢迎大家来访。如有错误之处，希望批评指正。原创博文如需转载请注明出处，谢谢 :) [CSDN博客]</td> 
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