Note that this is the third thread you have started titled "Help in awk/bash". More descriptive titles would help readers find the right thread.

In the last few posts in your last thread: Help in awk/bash, you said that one of the input files for this project was the file 11.txt which you said contained 10,000 entries. That seems to be the file atom.txt in this thread. You show that all IDs (which seem to be indices into that file) have three digit values(with leading zero fill). Is atom.txt limited to less than 1,000 entries or do some IDs have more than three digits?

You have way too many occurrences of ......... in your posting to determine what you want. In your description, you say:

Code:

Group   Centre      Branches              Id_of_Branches
 10       051          30            003, 007, 051, 034, .................. (30 values)   
 72       183          26            100,................................    
394       600          23             ...................................    
391       641          20             .....................................

what does "(30 values)" mean. Are there 30 fields (some with multiple spaces as separators, some with comma-space as separators [or terminators]) in every line? Are there 33 fields on every line (one for Group ID, one for Centre ID, one for Branches ID, and one for each of 30 branches)? Are there 3 + value_of_3rd_field fields? Give us real values at least for these 4 lines instead of making us guess what .......... means! Did you add commas between or after some fields just to make it harder to process the input?

You say you want 5 output files. Does that mean that g.txt will always contain 4 data lines (plus the line of headings)?

You say: "...5th file for patterns (plural) corresponding to Id (singular) from Centre...". Does this mean that Centre.txt is supposed to contain all 120 (or 99, or ???) entries that will be stored in the four Gxxx files? Does it just contain Id051 as shown? Or, does it contain one entry for each data line in g.txt?

I supplied several awk scripts with detailed explanations of how those script worked in your last thread on this subject (see link above). Can you show us the awk script you're writing to solve this problem? Or are you expecting us to figure out what you want done and do it for you? The purpose of The UNIX and Linux Forums is to help you learn how to write your own scripts; not to act as a place where you can get people to do your design and implementation work for you for free.