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Printing the lines that appear in an other file, and the three lines after them

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# 1  
Old 05-22-2012
Printing the lines that appear in an other file, and the three lines after them
Hi !
I need some help with a script I am writing.
I am trying to compare two files, the first file being in this format :
Code:
Header1
Text1-1
Text1-2
Text1-3
Header2
Text2-1
etc...

For each header, I want to check if it appears in the second file, and if it is the case print the header and the three corresponding lines of text.
I found several methods for finding the header in the second file, but I don't know how to get the lines that follow.

Thanks for your help !
# 2  
Old 05-22-2012
You'll need to post some of your real input, otherwise we'll make an example that works with your mock-up but not with your actual stuff.
# 3  
Old 05-23-2012
The first lines of my input are :
Code:
@SRR407306.1 GA2MACHINE1_1004:1:1:1139:9772 length=74      <-header
TCCCTAGCTTCTCTGGTGAGNTATNANNCAAGGTCCCTAANNNNNNNNNNTTAACACATGAANNNNNNNNNGTC
+SRR407306.1
EGGGDGGGDGGGGFGFEGDC#AAA#A##AB?B??GGGED=##########ACC@EEEEE>?#############
@SRR407306.2 GA2MACHINE1_1004:1:1:1139:5426 length=74      <-header
AATCTTGGCTCACTGCAACCNCCGNCNNCCTGGTTCAAGCNNNNNNNNNNCCTCAGCCTCCCNNNNNNNNNAGA
+SRR407306.2
F=FDEFEF:FFFFDFFB?B<#=>A#;##?=A@>7A?DDA6##########2A>=??ACCCB@############
@SRR407306.3 GA2MACHINE1_1004:1:1:1139:20595 length=74    <-header
TAGGAAGGCAGCTATGATGGNTCANGNNCAGGAAGGTGGGNNNNNNNNNNCAGCCTCCCTGANNNNNNNNNTCG

The file contains approximately 200 million lines.
I would also be glad if you could give me a bit of explanation on your code, so I can adapt it by myself if I need it.
Thanks
# 4  
Old 05-23-2012
Code:
awk '# If we are in the first file, and the line begins with @, save the header
# in the array A to find it later then skip to the next line
(NR==FNR) && /^@/ { A[$1]=1; next }
# Line begins with @, and line is found in the array, print it and the next three lines
/^@/ && ($0 in A) { print ; getline ; print ; getline ; print ; getline ; print }' reffile selectfile

This User Gave Thanks to Corona688 For This Post:
jbi
# 5  
Old 05-23-2012
Thank you for your help !
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