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extract text using sed

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BrianUK
 PostPosted: Sun Feb 06, 2011 2:42 pm   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
I'm using curl to get the below output but only want to get the output from in between the <LocalityName></LocalityName> tags. I can wittle it down using nawk 'NR==10' but would prefer using sed or similar, can anyone help?

Code:
<?xml version="1.0" encoding="UTF-8" ?>
<kml xmlns=""><Response>
  <name></name>
  <Status>
    <code>200</code>
    <request>geocode</request>
  </Status>
  <Placemark id="p1">
    <address></address>
    <AddressDetails Accuracy="5" xmlns="urn:oasis:names:tc:ciq:xsdschema:xAL:2.0"><Country><CountryNameCode></CountryNameCode><CountryName>UK</CountryName><Locality><LocalityName>EXTRACT</LocalityName><PostalCode><PostalCodeNumber></PostalCodeNumber></PostalCode></Locality></Country></AddressDetails>
    <ExtendedData>
      <LatLonBox north="0000000000" south="00000000" east="00000000" west="000000" />
    </ExtendedData>
    <Point><coordinates>00000000</coordinates></Point>
  </Placemark>
</Response></kml>
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scilec
 PostPosted: Sun Feb 06, 2011 4:29 pm   

Joined: Sat Jan 16, 2010 5:53 pm
Posts: 1
Hi,
I'm sure there's a more elegant way to do this but this is the first thing that popped into my head and it should get the job done for now. In a nutshell, the grep statement below grabs only the lines that contain "<LocalityName>" and then that output is piped into sed, which deletes everything from the beginning of the line (^) to "<LocalityName>" and then from "</LocalityName>" (in which the "/" is escaped by preceding it with a "\") to the end of the line.

$ grep "<LocalityName>" filename.xml | sed -r 's/^.*<LocalityName>//g; s/<\/LocalityName>.*$//g'
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Patsie
 PostPosted: Sun Feb 06, 2011 11:36 pm   
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Joined: Sun Jun 27, 2010 12:57 am
Posts: 192
Print only what is between the 2 named tags:
Code:
sed -n 's/.*<LocalityName>\(.*\)<\/LocalityName>.*/\1/p'
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BrianUK
 PostPosted: Mon Feb 07, 2011 4:14 am   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
Patsie wrote:
Print only what is between the 2 named tags:
Code:
sed -n 's/.*<LocalityName>\(.*\)<\/LocalityName>.*/\1/p'


works a treat thanks,

i'm extracting gps info using

Code:
sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.google.com/maps?q=\1,\2%;p}'


which returns http://maps.google.com/maps?q=0.0000000,-0.000000

after the last 0 I'd like it to add &output=xml so can anybody help me teak the above code to do this?

using the returned url i'd like to be able to extrack the Locality info ie

Code:
curl -s "URL" sed -n 's/.*<LocalityName>\(.*\)<\/LocalityName>.*/\1/p'


and finally put it into a script ie

GPS="blah blah"
echo "$GPS"
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BrianUK
 PostPosted: Fri Feb 11, 2011 10:29 am   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
anyone?
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jeo
 PostPosted: Fri Feb 11, 2011 1:00 pm   
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Posts: 273
Hi BrianUK!

I think I might be missing something here. Could we see some sample data for the file or output you're using to generate the URL?

Thanks!
-Jeo
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BrianUK
 PostPosted: Sat Feb 12, 2011 3:22 pm   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
In bash using my gps location software along with sed I'm returned

http://maps.google.com/maps/maps?q=00.0000,-0.00000

at the end of this url i'd like to add &output=xml

From the output of that url i'd like to run this command

Code:
curl -s "URL" sed -n 's/.*<LocalityName>\(.*\)<\/LocalityName>.*/\1/p'


which would give me for example 'London'
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Patsie
 PostPosted: Sun Feb 13, 2011 1:12 am   
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Joined: Sun Jun 27, 2010 12:57 am
Posts: 192
So, lets assume you google-maps URL is stored in $URL
you just run:
Code:
curl -s "${URL}&output=xml" | sed -n 's/.*<LocalityName>\(.*\)<\/LocalityName>.*/\1/p'

And you should be done, right?
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BrianUK
 PostPosted: Sun Feb 13, 2011 5:56 am   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
getting close

Code:
#!/bin/bash
URL=gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.google.com/maps/map?q=\1,\2%;p}'

LOCATION=curl -s "${URL}&output=xml" | sed -n 's/.*<LocalityName>\(.*\)<\/LocalityName>.*/\1/p'

while true
do

echo "$LOCATION"


Would this be the right way to do it?

./gps: line 4: -s: command not found
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Patsie
 PostPosted: Sun Feb 13, 2011 7:40 am   
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Joined: Sun Jun 27, 2010 12:57 am
Posts: 192
If you want to put the output of a command in a variable, use something line this:
Code:
var=$(command -args)

The way you do it, var=command -args, doesn't work.


Last edited by Patsie on Sun Feb 13, 2011 7:42 am, edited 1 time in total.

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Patsie
 PostPosted: Sun Feb 13, 2011 7:41 am   
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Posts: 192
double post, sorry.
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BrianUK
 PostPosted: Sun Feb 13, 2011 8:08 am   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
now i'm confused ha, is this for the URL or location bit? could you place it into the script for me?
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jeo
 PostPosted: Mon Feb 14, 2011 8:06 am   
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Posts: 273
What Patsie is saying is that in order to store the output of a command in a variable, you have to surround the command in $() or ``

So for our example:
Code:
# In your script, you're doing this, which will not work:
VARIABLE=commands to execute here

# The proper way looks more like this:
VARIABLE=$(commands to execute here)

# Here's an alternative way, with `back-ticks`
# But the one above is usually preferred
VARIABLE=`commands to execute here`

# To use YOUR script as an example:
URL=$(gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.google.com/maps/map?q=\1,\2%;p}')
LOCATION=$(curl -s "${URL}&output=xml" | sed -n 's/.*<LocalityName>\(.*\)<\/LocalityName>.*/\1/p')


Everything inside "$()" will be executed, and the ouptut will be stored in the variable you specified.

I hope this helps!
-J
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BrianUK
 PostPosted: Mon Feb 14, 2011 2:13 pm   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
Ahh I see what you mean I remember i've previously used back ticks and forgot them in my example, i'm tring your verison with

Code:
echo "$LOCATION"


at the end but not getting any output?
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BrianUK
 PostPosted: Thu Feb 17, 2011 7:42 am   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
?
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jeo
 PostPosted: Thu Feb 17, 2011 10:43 am   
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Hi BrianUK!

Try checking the output of your curl command by itself, without running it through sed. In my script, I get an error:

The requested URL <code>/maps/map?q=37.646182,-115.750827&amp;output=xml</code> was not found on this server.

BUT if I change the URL a bit... by replacing /maps/map with maps, I get the source of the map page, but it doesn't seem to understand the output=xml parameter.

It looks like you may have intended to use the google maps api?
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jeo
 PostPosted: Thu Feb 17, 2011 11:29 am   
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This script gives us some XML output, but it's not formatted the way your sed expression is looking for it.

Instead of <LocalityName> we have something like:

Code:
<address_component>
    <long_name></long_name>
    <short_name></short_name>
    <type>locality</type>
</address_component>


Here's what I've got so far:
Code:
#!/bin/bash

# I don't know what the gps command is/does so I
# created a dummy file with data that matches the regex
gps () {
    cat tmp.txt
}

URL=$(gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.googleapis.com/maps/api/geocode/xml?latlng=\1,\2\&sensor=false%;p}')
OUTPUT=$(curl -s "${URL}" | grep -B2 locality)

echo "$URL"
echo "$OUTPUT"
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BrianUK
 PostPosted: Thu Feb 17, 2011 1:32 pm   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
ok for what ever reason my 'gps' software doesn't work being called via a script. This works fine in command line

Code:
gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.google.com/maps?q=\1,\2%;p}'


but in a bash script using just

Code:
#!/bin/bash

URL=`gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.google.com/maps?q=\1,\2%;p}'`

echo "$URL"


it doesn't do anything so looks like i'll have to try it a different way.

Ah just run using -x and it appears to be running gps as one command and sed as another

++ gps
++ sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.google.com/maps?q=\1,\2%;p}'

any idea how to fix this?
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jeo
 PostPosted: Thu Feb 17, 2011 1:46 pm   
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Does your gps command require any parameters? That bash -x output looks normal (well... the two lines that you pasted anyway). Here are the first few lines of mine:

Code:
$ bash -x tmp.sh
++ gps
++ cat tmp.txt
++ sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.googleapis.com/maps/api/geocode/xml?latlng=\1,\2\&sensor=false%;p}'
+ URL='http://maps.googleapis.com/maps/api/geocode/xml?latlng=37.646182,-115.750827&sensor=false'


Does your bash -x run get as far as saying '+ URL=...'?
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BrianUK
 PostPosted: Thu Feb 17, 2011 2:03 pm   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
no it's doesn't need any parameters

no I only get the 2 lines I posted returned

works ok from the command line

Code:
gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.googleapis.com/maps/api/geocode/xml?latlng=\1,\2\&sensor=false%;p}'

http://maps.googleapis.com/maps/api/geocode/xml?latlng=00.000000,-0.00000&sensor=false
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jeo
 PostPosted: Thu Feb 17, 2011 2:42 pm   
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Posts: 273
Interesting... Here's a simpler test... What happens if you just run 'gps' from a script, and don't try to parse the output?

Code:
echo -e '#!/bin/bash\ngps' > mytest.sh
chmod +x mytest.sh
./mytest.sh
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BrianUK
 PostPosted: Thu Feb 17, 2011 2:58 pm   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
works fine, even if I do

Code:
#!/bin/bash

gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.googleapis.com/maps/api/geocode/xml?latlng=\1,\2\&sensor=false%;p}'


but add a but more and a couple of ticks

Code:
#!/bin/bash

URL=`gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.google.com/maps?q=\1,\2%;p}'`

echo "$URL"


and I get nothing
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jeo
 PostPosted: Thu Feb 17, 2011 3:26 pm   
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There's only one more thing I can think of to try. Instead of `backticks` try using enclosing it in $(here) like in our examples above.
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BrianUK
 PostPosted: Thu Feb 17, 2011 3:58 pm   

Joined: Fri May 16, 2008 4:58 am
Posts: 95
Code:
./location5: line 5: syntax error near unexpected token `|'
./location5: line 5: `URL=(gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.googleapis.com/maps/api/geocode/xml?latlng=\1,\2\&sensor=false%;p}')'
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jeo
 PostPosted: Fri Feb 18, 2011 10:31 am   
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Posts: 273
You're missing a "$" :)
It should look like one of the many examples above:

Code:
## Generic example (thanks Patsie!):
var=$(command -args)

## Specific example:
URL=$(gps | sed -rn '/<trkpt lat="/{s%.* lat="([^"]+)" lon="([^"]+)">.*%http://maps.googleapis.com/maps/api/geocode/xml?latlng=\1,\2\&sensor=false%;p}')


I hope this helps!
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