LinuxQuestions.org - using grep to find text sections

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using grep to find text sections

i want to use the grep tool to be able to find a city in an xml document by locating the tag after the state and the for before the town. here is part of the code. this code is located in ~/.cache/weather.xml
<description>Yahoo! Weather for Town, State</description>

how would i be able to find the code?

Should be simple. Can you provide a bit more of the XML that is related to what you requested?

Perl would be better:

Code:

perl -ne '/Weather for (.*)\</ && print $1,"\n";' < file

You can use sed. (just a fast example, the syntax can be improved)

if you want to extract just "Town"

Code:

echo "<description>Yahoo! Weather for Town, State</description>" | sed -n 's/.*for $.*$,.*/\1/p'

if you want to extract "Town, State"

Code:

echo "<description>Yahoo! Weather for Town, State</description>" | sed -n 's/.*for $.*$<.*/\1/p'

how would i use sed (or perl) to look into the xml document?

lines 1-22 of xml document
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<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#">
<channel>

<title>Yahoo! Weather - Town, State</title>
<link>http://us.rd.yahoo.com/dailynews/rss/weather/Town__State/*http://weather.yahoo.com/forecast/USAII000_A.html</link>
<description>Yahoo! Weather for Town, State</description>
<language>en-us</language>
<lastBuildDate>Thu, 17 Jul 2014 6:14 am CDT</lastBuildDate>
<ttl>60</ttl>
<yweather:location city="Town" region="State" country="United States"/>
<yweather:units temperature="F" distance="mi" pressure="in" speed="mph"/>
<yweather:wind chill="52" direction="0" speed="0" />
<yweather:atmosphere humidity="94" visibility="10" pressure="30.08" rising="0" />
<yweather:astronomy sunrise="5:53 am" sunset="8:44 pm"/>
<image>
<title>Yahoo! Weather</title>
<width>142</width>
<height>18</height>
<link>http://weather.yahoo.com</link>
<url>http://l.yimg.com/a/i/brand/purplelogo//uh/us/news-wea.gif</url>
</image>

Code:

perl -ne '/for (.*),.*<\/description>/ and print "$1\n"' ~/.cache/weather.xml

- matches "the tag after the state", so "</description>"
- print chars after the "for " and before the ","