Print 4th line back from regexp

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# 1  
Old 11-15-2013
Print 4th line back from regexp

I'm looking for a way to print the 4th line back from a regular expression. Kind of like the below but it has to be the 4th line before the regexp.
  • Print the line immediately before regexp, but not the line containing the regexp.
sed -n '/regexp/{g;1!p;};h'

here is an example of logs(i chopped the logs bc each line is too long)
01:59:09,260 DEBUG SOAP REQUEST: <SOAP-ENV:..<ns1:mdn>NPANXX<
01:59:09,260 INFO  [com
01:59:09,273 INFO  [org.apache
01:59:09,283 INFO  [stdout]
01:59:29,780 WARNING SendProv has thrown exception

I'm looking for "SendProv has thrown exception" and want to parse the MDN where it threw the exception.

Any ideas?

Last edited by Scott; 11-15-2013 at 06:52 PM.. Reason: Code tags for data too
# 2  
Old 11-15-2013
awk '{a[NR]=$0;a[NR-5]=""}/SendProv has thrown exception/{print a[NR-4]}' file

# 3  
Old 11-15-2013
sed -n -e '/SendProv has thrown exception/{p;g;p;}' -e 's/.*\(mdn>[^>]*<\).*/\1/;ta' -e 'b' -e ':a' -e 'h'

---------- Post updated at 08:46 PM ---------- Previous update was at 08:35 PM ----------

Only save and print the mdn line is quite easy
sed -n -e '/SendProv has thrown exception/{g;p;}' -e '/mdn>/h'

# 4  
Old 11-20-2013
here are the commands i used to accomplish this. not sure if i could have done it with one

Extract the 4th line above SendProv has thrown exception
awk '{lines[NR] = $0} /SendProv has thrown exception/ {print lines [NR-4]} {delete lines[NR-4]}' server.log>>myfile

extract only the section of MDN
awk -F'mdn' '{for(i = 2; i < NF; i += 2) print $i}' myfile>>myfile1


extract just NPANXX1234(this is the actual MDN)
cut -c2-11 myfile1>>myfile2


remove duplicates
awk '!x[$0]++' myfile2>>myfile3

# 5  
Old 11-20-2013
Try this:
awk '{TMP[NR%5]=$0} /SendProv/ {FS="[<>]"; $0=TMP[(NR+1)%5]; print $4}' file

You may have to add the duplicate removal code...
# 6  
Old 11-22-2013
I'm sure this has been solved already given the tag but is you are looking to resolve the line
1:59:09,260 DEBUG SOAP REQUEST: <SOAP-ENV:..<ns1:mdn>NPANXX<

Simply use the command: grep -B5 "SendProv" testing.txt | head -1
# 7  
Old 11-22-2013
Non-linux users are unlikely to have -B.
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