如何悄悄登入老板的系统 然后悄悄的离开

首先我指的登入是指 linux 系统获得 shell ,首先科普下 linux 系统管理员经常使用的查看当前和历史登录过系统用户的命令：

1：w：可以查看登录用户的数目，使用的字符设备等。

<code class="hljs css has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-attr_selector" style="color: rgb(0, 136, 0); box-sizing: border-box;">[root@yangbodong log]</span># <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">w</span>
 08<span class="hljs-pseudo" style="color: rgb(0, 0, 0); box-sizing: border-box;">:55</span><span class="hljs-pseudo" style="color: rgb(0, 0, 0); box-sizing: border-box;">:32</span> <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">up</span> 13<span class="hljs-pseudo" style="color: rgb(0, 0, 0); box-sizing: border-box;">:42</span>,  2 <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">users</span>,  <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">load</span> <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">average</span>: 0<span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.35</span>, 0<span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.70</span>, 0<span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.65</span>
<span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">USER</span>     <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">TTY</span>        <span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">LOGIN</span><span class="hljs-at_rule" style="box-sizing: border-box;">@   IDLE   JCPU   PCPU WHAT
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>     Tue19    <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4.00</span>s  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.44</span>s <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">17.38</span>s /usr/libexec/gnome-terminal-server
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>     Tue19    <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">09</span>m  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.15</span>s  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0.15</span>s bash</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li></ul>

2：who ：查看当前登录的用户，加些参数就和w一样了!

<code class="hljs perl has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@yangbodong</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">log</span>]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># who</span>
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>        <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2016</span>-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">03</span>-08 <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span> (:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>        <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2016</span>-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">03</span>-08 <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">22</span> (:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>)</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>

3：last ：查看所有登录过我们系统的用户，实际上读取/var/log/wtmp文件，嘿嘿，你是不是猜到我要干什么了……

<code class="hljs mel has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@yangbodong</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">log</span>]# last | head -<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">34</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">41</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">06</span>)    
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">22</span>   still logged <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>   
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>   still logged <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>   
kiosk    :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>           :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">14</span>   still logged <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">in</span>   
reboot   <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">system</span> boot  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3.10</span><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.0</span>-<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">123.</span>el7.x Wed Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">9</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">03</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">13</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">09</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">11</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">05</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">58</span>)    
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">4</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">55</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">18</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">42</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">01</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">47</span>)    
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">48</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">18</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">43</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">01</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">54</span>)    
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">29</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">18</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">42</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">02</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">13</span>)    
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">3</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">23</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">25</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">01</span>)    
kiosk    pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>        :<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>               Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">19</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">16</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">29</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>)    </code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li></ul>

head -10 : 只显示前十行。

4：lastb：查看所有登录我们系统失败的用户，读取的是/var/log/btmp。

<code class="hljs perl has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@yangbodong</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">log</span>]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># lastb </span>
root     pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>                         Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">52</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">52</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>)    
root     pts/<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>                         Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">12</span> - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">12</span>  (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">00</span>)    

btmp begins Tue Mar  <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">8</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">15</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">12</span>:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">37</span> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2016</span>
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

有关这四个命令的详细解释：点这里

好，下面我们开始重点环节，”入侵”了啊。我要干这样一件事，登录老板的阿里云主机，然后给他提出加薪要求，最后退出来，当然不能被他发现啊，你问我老板是谁？？瑞神啊，看他博客你就知道了点这里，好，趁他现在还没来，我要开始行动了，不然坐在他对面干这些事多不好。^_^。。。

1：登录他的系统 

2：last 来看看，果然，我的信息被忠实的记录了，老板一个last命令就知道我来过，我不是就被炒了！ 

3：不管三七二十八，先告诉他我要加薪。我打算这样做，每隔5分钟给老板的终端上显示"老板，给我加点薪吧！"，这就需要我设置个定时发送啊，还好linux上有at和crontab，关于它们的具体用法：点这里 
我就不用at了，因为at只执行一次，我估计以老板的性格没个千八百次我觉得难。直接crontab。

<code class="hljs ruby has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@iZ28clh60afZ</span> ~]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># crontab -e</span>
*<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/1 * * * * echo "老板,给我加点薪吧!" > /dev</span><span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/pts/</span><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>   /<span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">/这是编辑的内容</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

完了之后crontab -l看下 ,发现我们设置的任务已经在执行队列中。 

过了一分钟，嘿嘿！已经有效果了,来看看 

4：好了，任务结束，开始销毁足迹。由于last命令读取的是/var/log/wtmp文件，所以……嘿嘿！删掉我的记录不就好了吗？于是我vim /var/log/wtmp

<code class="hljs ruby has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@iZ28clh60afZ</span> ~]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># vim /var/log/wtmp </span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>

 
不对啊，这是？？没办法，file了一下：

<code class="hljs mel has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@iZ28clh60afZ</span> ~]# <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">file</span> /var/<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">log</span>/wtmp 
/var/<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">log</span>/wtmp: data     <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//果然是个数据文件</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

那我总不能就这样离开啊，这会被老板打死的…..于是在我的谷歌下，我找到了一个神器: 
hexedit,下面是安装方法：

<code class="hljs cmake has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">ubuntu : sudo apt-get <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">install</span> hexedit
centos & redhat : yum <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">install</span> hexdeit</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

如图：我已经装好了: 

下面我们就去修改/var/log/wtmp

<code class="hljs ruby has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">[root<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">@iZ28clh60afZ</span> ~]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;"># hexedit /var/log/wtmp </span>
</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li></ul>

然后按tab键可以切换到右边文本段，注意，last命令显示的最上面的信息是文本段的末尾，所以我们按page down键，可以一直到达文本的末尾。然后看到有字的地方就用空格把它替换，直接在字上输入空格就可以，之后ctrl + x退出保存，然后我们就可以看看战绩了。

额。不过我好像没有把后面的时间清除干净，但是老板已经没有我的IP了，那就不用怕了。

轻轻的，我走了，我挥一挥衣袖，不留下痕迹。