grep and cut problem - UNIX for Dummies Questions & Answers

Rajat · #1 07-23-2008

Hello folks,
I have to (e)grep out a certain pattern e.g. <TAG1> from a huge log file which does not have any space as such.
The thing is that once I have 'grep'ed out the <TAG1> from the file I need to extract the content within the tags, i.e,
<TAG1>Data_To_Be_Extracted</TAG1>
The underlined data needs to be extracted.
The problem is that with such a huge file with big wide lines with lots of tags I can't get hold of any delimiter.
Thanks in advance.

zaxxon · #2 07-23-2008

Code:

sed 's/.*<TAG1>\([^>]*\)<\/TAG1>.*/\1/g'

Rajat · #3 07-23-2008

I am sorry Zaxxon but wont this be just replacing the stuff? Please forgive my incompetence with sed. Is there any subString sort of functionality in UNIX?

joeyg · #4 07-23-2008

It can often be easier to understand when we see actual data, as opposed to answering a theoretical question.

zaxxon · #5 07-23-2008

Nodding to joeyg, I can say that the sed code was working with your example, see yourself:

Code:

root@isau02:/data/tmp/testfeld> cat infile2
somelala.awno2irbn8sp+0<TAG1>Data_To_Be_Extracted</TAG1>some more data or is it rubbish or blaapowjdaowih2
xawmwduhawudhguvsiu31ell.wor8sp+0<TAG1>Data_To_Be_Extracted</TAG1>jscb akjbfq23jrbfhhhh3
aukwdhaiubf23__fgv<TAG1>Data_To_Be_Extracted</TAG1>e mot ri t ubs rjsa 3221u3r
root@isau02:/data/tmp/testfeld> sed 's/.*<TAG1>\([^>]*\)<\/TAG1>.*/\1/g' infile2
Data_To_Be_Extracted
Data_To_Be_Extracted
Data_To_Be_Extracted
root@isau02.debeka.de:/data/tmp/testfeld>

I thought that is what you wanted. You got the stuff between those two tags. It's not touching the input file, if you mean that.

Rajat · #6 07-23-2008

Thanks a lot Zaxxon

... it is running fine when I am hard coding the file name but if I am putting the file name like:
sed 's/.*<TAG1>$[^>]*$<\/TAG1>.*/\1/g' $fileName it is returning the entire file.
Note: There are multiple occurences of <TAG1>.

Rajat · #7 07-23-2008

i guess it's just working with just one particular file for some weird reason ... any suggestions people?

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