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Full Discussion: Joining ends of strings in certain order with repeated ID's
Top Forums UNIX for Dummies Questions & Answers Joining ends of strings in certain order with repeated ID's Post 302894353 by verse123 on Tuesday 25th of March 2014 03:53:50 AM
Old 03-25-2014
Here's a sample input for an example of 3 occurrences. I want to generate specific combinations of a 9 character substring based on the last occurrence of the ID %dog (line 3) with the beginning substring of the second occurrence of the ID.

input:
Code:
%dog  CATCAToooooooooooooooDOGDOG
%dog  HIHIoooooooooooooooBYEBYE
%dog  hellooooooooooooooooGOGOGO

output:
Code:
%dog   oooGOGOGOHIHIooooo

In this example, I show what the output looks like for 1 of the rules. Notice how the last 9 character substring from the third line is now in the beginning of column 2 and it is followed by the first 9 character substring from the second occurrence of the line with the ID %dog. Another possibility exists and that is to swap the beginning and end substrings of the last line (line 3) with itself. And also to swap the last substring with the beginning substring of the first line with itself.

output:
Code:
%dog   oooGOGOGOhellooooo
%dog   oooDOGDOGCATCATooo


The final output for this example should have three lines, based on the following rules:

Code:
1) last substring of line 3 with beginning substring of line 3
2) last substring of line 3 with beginning substring of line 2
3) last substring of line 1 with beginning substring of line 1

final output:
Code:
%dog   oooGOGOGOhellooooo
%dog   oooGOGOGOHIHIooooo
%dog   oooDOGDOGCATCATooo

Does this help?
 

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LEARN ABOUT MINIX

grep

GREP(1) 						      General Commands Manual							   GREP(1)

NAME

       grep - search a file for lines containing a given pattern

SYNOPSIS

       grep [-elnsv] pattern [file] ...

OPTIONS

       -e     -e pattern is the same as pattern

       -c     Print a count of lines matched

       -i     Ignore case

       -l     Print file names, no lines

       -n     Print line numbers

       -s     Status only, no printed output

       -v     Select lines that do not match

EXAMPLES

       grep mouse file	   # Find lines in file containing mouse

       grep [0-9] file	   # Print lines containing a digit

DESCRIPTION

       Grep  searches  one  or	more  files (by default, stdin) and selects out all the lines that match the pattern.  All the regular expressions
       accepted by ed and mined are allowed.  In addition, + can be used instead of * to mean 1 or more occurrences, ? can be used to mean 0 or  1
       occurrences,  and  |  can  be used between two regular expressions to mean either one of them.  Parentheses can be used for grouping.  If a
       match is found, exit status 0 is returned.  If no match is found, exit status 1 is returned.  If an error is detected,  exit  status  2	is
       returned.

SEE ALSO

       cgrep(1), fgrep(1), sed(1), awk(9).

																	   GREP(1)
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