Ttdfjt

I have two files. One file includes structured data and be low is a sample.

article 1 title
article 1 body line 1
article 1 body line 2
+++
article 2 title
article 2 body line 1
article 2 body line 2
article 2 body line 3
+++
article 3 title
article 3 body line 1
article 3 body line 2
+++
article 4 title
article 4 body line 1
article 4 body line 2
article 4 body line 3

As you can see, +++ is the separator for records. For each record, the first line is the title, all other lines are the content of this record. Another file is a simple text file with a list of titles. For example:

article 1 title
article 3 title
article 4 title

What I want is the records with their title listed in the second file. So for the aforementioned example, the expected result is:

article 1 title
article 1 body line 1
article 1 body line 2
+++
article 3 title
article 3 body line 1
article 3 body line 2
+++
article 4 title
article 4 body line 1
article 4 body line 2
article 4 body line 3

I think awk could probably solve my problem but I don't know how.

What I've tried is this:

awk 'BEGINRS="(r?n)?+3(r?n)?"; FS="r?n"; ORS="+++" NR==FNRa[$0];next ...' title_list.txt data.txt

My problem is that the RS for the two files should be different and I don't know how to make it work.

You can set variables like RS separately for each file. For example:

$ awk 'NR==FNRa[$0];next $1 in a' RS='r?n' title_list.txt RS='+++r?n' FS='r?n' ORS='+++n' data.txt
article 1 title
article 1 body line 1
article 1 body line 2
+++
article 3 title
article 3 body line 1
article 3 body line 2
+++
article 4 title
article 4 body line 1
article 4 body line 2
article 4 body line 3
+++

In gawk you can use special blocks BEGINFILE and ENDFILE to set whatever rules you need before/after reading new file, for example:

$ awk 'NR==FNRa[$0]++;nextENDFILERS="+++n";FS="n"a[$1]printf $0RT' title_list.txt data.txt 

article 1 title
article 1 body line 1
article 1 body line 2
+++
article 3 title
article 3 body line 1
article 3 body line 2
+++
article 4 title
article 4 body line 1
article 4 body line 2
article 4 body line 3

Done by below method using combination of sed and awk

command

 k=`awk 'print NR' file2| sed -n '$p'`

for ((i=1;i<=$k;i++)); do j=`awk -v i="$i" 'NR==iprint $0' file2`; sed -n "/$j/,/+++/p" file1; done


output

for ((i=1;i<=$k;i++)); do j=`awk -v i="$i" 'NR==iprint $0' file2`; sed -n "/$j/,/+++/p" file1; done
article 1 title
article 1 body line 1
article 1 body line 2
+++
article 3 title
article 3 body line 1
article 3 body line 2
+++
article 4 title
article 4 body line 1
article 4 body line 2
article 4 body line 3