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从文本文件中提取数据

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从文本文件中提取数据

我正在尝试从下载的文本文件中提取数据（温度）wget。

例如。wget http://www.weatherzone.com.au/sa/adelaide/adelaide

如何从文件中提取“18.6”的信息并将其复制到另一个文件以供另一个应用程序使用？

less adelaide
---snip---
'<span id="top_obs_temp" class="tempnow">18.6&deg;C</span>'
---snip---

短暂性脑缺血发作

答案1

使用awk

$ wget http://www.weatherzone.com.au/sa/adelaide/adelaide
$ awk  -F '[<|>|&]' '/tempnow/ {print $3}' adelaide
20.0

或一体式

$ wget -q -O- http://www.weatherzone.com.au/sa/adelaide/adelaide | awk  -F '[<|>|&]' '/tempnow/ {print $3}' 
20.1

只要标签中具有class该值的属性，此方法即可起作用。tempnowspan

<span id="top_obs_temp" class="tempnow">18.6&deg;C</span>

现在我被列入黑名单了哦哦 :P

wget http://www.weatherzone.com.au/sa/adelaide/adelaide                                                  
--2015-11-06 08:17:37--  http://www.weatherzone.com.au/sa/adelaide/adelaide
Resolving www.weatherzone.com.au (www.weatherzone.com.au)... 104.101.241.181
Connecting to www.weatherzone.com.au (www.weatherzone.com.au)|104.101.241.181|:80... connected.
HTTP request sent, awaiting response... 403 Forbidden
2015-11-06 08:17:37 ERROR 403: Forbidden.

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