如何删除指定文本里面的一段文字呢？

Kenbaby

问题是这样，我在博客上面加了一个天气预报，也就是小偷那种，用的是php里面的xml_rss，抓取yahoo的rss天气预报，先用fetch抓取xml文件到tmp目录里面，程序就读这个文件了，设置cron每小时抓一次，直接读远程文件速度太慢了。

但是yahoo的xml文件里面含有链接，我想删除它的链接，如果使用纯命令，应该用哪些命令结合起来删除之呢？比如find ,rm ,mv，grep

完整的xml文件如下 ，我想删除的是这个链接：

1. 
   
2. <a href="http://us.rd.yahoo.com/dailynews/rss/weather/Chongqing__CH/*http://xml.weather.yahoo.com/forecast/CHXX0017_c.html">Full Forecast at Yah
   
3. oo! Weather</a><BR/>

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1. <?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
   
2. <rss version="2.0" xmlns:yweather="http://xml.weather.yahoo.com/ns/rss/1.0" xmlns:geo="http://www.w3.org/2003/01/geo/wgs84_pos#">
   
3. <channel>
   
4. <title>Yahoo! Weather - Chongqing, CH</title>
   
5. <link>http://us.rd.yahoo.com/dailynews/rss/weather/Chongqing__CH/*http://xml.weather.yahoo.com/forecast/CHXX0017_c.html</link>
   
6. <description>Yahoo! Weather for Chongqing, CH</description>
   
7. <language>en-us</language>
   
8. <lastBuildDate>Fri, 28 Apr 2006 4:00 pm CST</lastBuildDate>
   
9. <ttl>60</ttl>
   
10. <yweather:location city="Chongqing" region="" country="CH" />
    
11. <yweather:units temperature="C" distance="km" pressure="mb" speed="kph" />
    
12. <yweather:wind chill="23" direction="190" speed="14" />
    
13. <yweather:atmosphere humidity="61" visibility="600" pressure="0" rising="2" />
    
14.   <yweather:astronomy sunrise="6:15 am" sunset="7:29 pm" />
    
15.   <image>
    
16. <title>Yahoo! Weather</title>
    
17. <width>142</width>
    
18. <height>18</height>
    
19. <link>http://weather.yahoo.com/</link>
    
20. <url>http://us.i1.yimg.com/us.yimg.com/i/us/nws/th/main_142b.gif</url>
    
21. </image>
    
22. <item>
    
23. <title>Conditions for Chongqing, CH at 4:00 pm CST</title>
    
24.   <geo:lat>29.52</geo:lat>
    
25. <geo:long>106.48</geo:long>
    
26.   <link>http://us.rd.yahoo.com/dailynews/rss/weather/Chongqing__CH/*http://xml.weather.yahoo.com/forecast/CHXX0017_c.html</link>
    
27. <pubDate>Fri, 28 Apr 2006 4:00 pm CST</pubDate>
    
28. <yweather:condition text="Sunny" code="32" temp="23" date="Fri, 28 Apr 2006 4:00 pm CST" />
    
29. <description><![CDATA[
    
30. <img src="http://us.i1.yimg.com/us.yimg.com/i/us/we/52/32.gif" /><br />
    
31. <b>Current Conditions:</b><br />
    
32. Sunny, 23 C<BR /><BR />
    
33. <b>Forecast:</b><BR />
    
34.   Fri - Partly Cloudy. High: 24 Low: 15<br />
    
35.   Sat - Mostly Sunny. High: 28 Low: 16<br />
    
36. <br />
    
37. <a href="http://us.rd.yahoo.com/dailynews/rss/weather/Chongqing__CH/*http://xml.weather.yahoo.com/forecast/CHXX0017_c.html">Full Forecast at Yah
    
38. oo! Weather</a><BR/>
    
39. (provided by The Weather Channel)<br/>
    
40. ]]></description>
    
41. <yweather:forecast day="Fri" date="28 Apr 2006" low="15" high="24" text="Partly Cloudy" code="30" />
    
42. <yweather:forecast day="Sat" date="29 Apr 2006" low="16" high="28" text="Mostly Sunny" code="34" />
    
43.   <guid isPermaLink="false">CHXX0017_2006_04_28_16_0_CST</guid>
    
44. </item>
    
45. </channel>
    
46. </rss>
    
47. <!-- p1.weather.scd.yahoo.com uncompressed Fri Apr 28 01:23:22 PDT 2006 -->

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[ 本帖最后由 Kenbaby 于 2006-4-28 17:00 编辑 ]