title: How can I see all of the bash history?
body: <p>First let me show an example below.</p>
  
  <p>In shell(1) I did the following command.</p>
  
  <pre><code>$ ping google.com
  PING google.com (74.125.235.164) 56(84) bytes of data.
  64 bytes from nrt19s12-in-f4.1e100.net (74.125.235.164): icmp_seq=1 ttl=54 time=2.85 ms
  64 bytes from nrt19s12-in-f4.1e100.net (74.125.235.164): icmp_seq=2 ttl=54 time=3.42 ms
  </code></pre>
  
  <p>And after that, open another shell(2) and look at history.</p>
  
  <pre><code>$ history
   .
   .
   .
   8720  exit
   8721  clear
   8722  history
  </code></pre>
  
  <p>In this case, the shell can not see the history executed by shell(1), but I want to see all of the bash history in every shell.</p>
  
  <p>So my question is how can I see all of the bash history? Does anybody know how to hack?</p>
  
  <p>Thank you very much in advance!</p>