title: how to use sed to delete some string
body: <p>In my case</p>
  
  <p>text:</p>
  
  <pre><code>21 130.104.72.201 3124 HTTP [C]±ÈÀûÊ± ·¨ÓïÂ³ãëÌìÖ÷½Ì´óÑ§ 03-05 14:34 0.238
  22 129.108.202.10 3128 HTTP [C]ÃÀ¹ú µÂ¿ËÈøË¹´óÑ§ 03-05 14:08 1.983
  23 130.88.203.27 3128 HTTP [C]Ó¢¹ú Âü³¹Ë¹ÌØ´óÑ§ 03-05 14:08 0.996
  24 129.74.152.66 3124 HTTP [C]·¨¹ú Ê¥Ä¸ÂêÀûÑÇ´óÑ§ 03-05 14:08 0.922
  </code></pre>
  
  <p>command:</p>
  
  <pre><code>sed 's/HTTP.*://' ip_all02.txt
  </code></pre>
  
  <p>but nothing was deleted.</p>