Comparing file content in two different directories - shell

Question

I have four files in two directories: 1.txt and 2.txt in one directory and 3.txt and 4.txt in another one. I want to compare the first pattern starting with word "query" in these text files and match the files existing in two different directories.
How can I do it?
Example:
1.txt
ABC
Query : JKLTER
2.txt
ABC
Query : PCA
3.txt
Query :JKLTER
XYSH
Query : ABC
4.txt
GFHHH
Using the command I could derive these two files from the directories just based on first pattern (starting with Query) matched.
Output :
Matched files : 1.txt 3.txt

Answer 1

I have something that is hopefully close enough - else you can diddle around with it a bit to get it closer.
So, if you use GNU awk to find the first line containing the word Query in all the files in a directory and then print the last word on that line and the name of the current file, you will get this for your first directory d1:
awk -F'[ :]*' '/Query/{print $NF,FILENAME; nextfile}' d1/*txt
JKLTER d1/1.txt
PCA d1/2.txt
And this for the second directory d2:
awk -F'[ :]*' '/Query/{print $NF,FILENAME; nextfile}' d2/*txt
JKLTER d2/3.txt
You can then pass the output of each of those commands to join to have it join lines wherein the first field matches:
join <(awk -F'[ :]*' '/Query/{print $NF,FILENAME; nextfile}' d1/*txt) <(awk -F'[ :]*' '/Query/{print $NF,FILENAME; nextfile}' d2/*txt)
Output
JKLTER d1/1.txt d2/3.txt
You can get rid of the leading directory by changing into each directory before running awk:
join <(cd d1; awk -F'[ :]*' '/Query/{print $NF,FILENAME; nextfile}' *txt) <(cd d2; awk -F'[ :]*' '/Query/{print $NF,FILENAME;nextfile}' *txt)
Output
JKLTER 1.txt 3.txt
You can get rid of the common field used by join like this:
join <(...) <(...) | awk '{$1="";print}'
Output
1.txt 3.txt
If you only have text files and nothing else in each subdirectory, and there are actually spaces after the colon following the word Query, my solution can be simplified to:
join <(cd d1; awk '/Query/{print $NF,FILENAME; nextfile}' *) <(cd d2; awk '/Query/{print $NF,FILENAME;nextfile}' *) | awk '{print $2,"matches",$3}'
Output
1.txt matches 3.txt