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extract x lines after a pattern - place each result in separate file

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# 1  
Old 06-06-2008
extract x lines after a pattern - place each result in separate file
Hi all,

I have many files that have 1 or more occurrences of the information I want. There are two distinct sets of information. I want get this info and place each occurrence in its own file.

The 3 lines before one set are

this grid
00 01 02
16 17 18
**40 lines of code I want to place in file this_xx.out**

The 3 lines before the second set are

that grid
00 01 02
16 17 18
**40 lines of code I want to place in file that_xx.out**

I do not want to have the 00 01 02 and 16 17 18 in the .out file.

The information in the next 40 lines is a matrix of hex number so there is nothing to hook onto in there to get the info.


Thanks for the help
gobi
# 2  
Old 06-06-2008
Try this:

Code:
awk '/grid$/{getline;getline;for(i=0;i<40;i++){if(getline){print}}}' file > that_xx.out

Regards
# 3  
Old 06-06-2008
Hammer & Screwdriver One solution, or at least an approach to solve
Code:
> cat file1
patt_a
01 02 03
04 05 06
a1
a2
a3
a4
patt_c
a1
patt_b
01 02 03
04 05 06
b1
b2
b3
b4
patt_d
d1
d2
patt_a
01 02 03
04 05 06
a1
a2
a3
a4

Code:
> cat sep_to2
#! /bin/bash

inf=file1
outf1=output_a
outf2=output_b
rm $outf1 2>/dev/null
rm $outf2 2>/dev/null

flag=
count=0
while read zf
   do
   if [ "$zf" = "patt_a" ] ; then
      flag="a"
      count=1
      continue
   fi
   if [ "$zf" = "patt_b" ] ; then
      flag="b"
      count=1
      continue
   fi
   if [ "$zf" = "01 02 03" ] ; then
      continue
   fi
   if [ "$zf" = "04 05 06" ] ; then
      continue
   fi

   if [ "$flag" = "a" ] ; then
      if [ "$count" -le 4 ] ; then
         echo "$zf" >>$outf1
         count=$((count+1))
      fi
   fi
   if [ "$flag" = "b" ] ; then
      if [ "$count" -le 4 ] ; then
         echo "$zf" >>$outf2
         count=$((count+1))
      fi
   fi
done<$inf

Code:
> cat output_a
a1
a2
a3
a4
a1
a2
a3
a4

Code:
> cat output_b
b1
b2
b3
b4

# 4  
Old 06-06-2008
Franklin52,

Am I missing something because this does not work.

joeyg,

Thanks! I had something similar to this but yours is better. I was hoping to get some slick awk or sed command to do this. I just don't have the time right now to go though a tutorial.

gobi
# 5  
Old 06-06-2008
Computer sed or awk can probably do better
Gobi,

I feel the same way. I see the sample solutions on this forum using sed or awk, but haven't quite got the handle on it yet. The command lines for sed and awk just look confusing!
Perhaps it is that the solutions offered using sed/awk are samples and not working code. Thus, the confusion in trying to figure out what is happening.
# 6  
Old 06-06-2008
Quote:
Originally Posted by gobi
Franklin52,

Am I missing something because this does not work.

gobi
What does'nt work? Errors? Wrong output? No output?
Try nawk if you get errors. It should work if the file has the exact format as you described.

Regards
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