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Full Discussion: Merge files
Top Forums Shell Programming and Scripting Merge files Post 302801987 by manas_ranjan on Thursday 2nd of May 2013 06:24:32 PM
Old 05-02-2013
Merge files
Code:
a.txt

id 	name 	subject
12	aaa	History
23	bbb	Science
45	ccc	Zoology

Code:
b.txt
id	layer	LayerNo
12	xxx12	1
23	yyy23	2
23	lll23	3
45	xxx45	1
45	yyy45	2
45	lll45	3

i have file a.txt which is parent file and another children file b.txt . Both files are linked together by common field called "id".

Interesting part child file have multiple layers name associated with ids. (we are only aware that in b.txt for each id there could be max 3 layers)
Now I need to join both file a.txt and b.txt as below
*since we know ids could have max 3layers*
*Layerno ranks/evaluate each layer position/value*

e.g. for id 12 layer no 1 is only specified, that means out of max allowed 3 layers, id 12 got only 1st layer value and rest of layers as zero.

So final file should look like
Code:
id 	name 	subject		layer1		Layer2		Layer3
12	aaa	History		        xxx12		0		0
23	bbb	Science		0		yyy23		lll23
45	ccc	Zoology		xxx45		yyy45		lll45

In my actual scenario file a.txt contains 600,000records. So my script taking bit long time than expected to merge. Therefore, can someone suggest how to carry this same operation in awk in easy way.
 

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LEARN ABOUT DEBIAN

x2sys_merge

X2SYS_MERGE(1gmt)					       Generic Mapping Tools						 X2SYS_MERGE(1gmt)

NAME

       x2sys_merge - Merge an updated COEs tables

SYNOPSIS

       x2sys_merge -Amain_COElist.d -Mnew_COElist.d

DESCRIPTION

       x2sys_merge  will read two crossovers data base and output the contents of the main one updated with the COEs in the second one. The second
       file should only contain updated COEs relatively to the first one.  That is, it MUST NOT contain any new  two  tracks  intersections  (This
       point  is  NOT checked in the code). This program is useful when, for any good reason like file editing NAV correction or whatever, one had
       to recompute only the COEs between the edited files and the rest of the database.

       -A     Specify the file main_COElist.d with the main crossover error data base.

       -M     Specify the file new_COElist.d with the newly computed crossover error data base.

OPTIONS

       No space between the option flag and the associated arguments.

       EXAMPLES
	      To update the main COE_data.txt with the new COEs estimations saved in the smaller COE_fresh.txt, try

	      x2sys_merge -ACOE_data.txt -MCOE_fresh.txt > COE_updated.txt

SEE ALSO

       x2sys_binlist(1), x2sys_cross(1), x2sys_datalist(1), x2sys_get(1), x2sys_init(1), x2sys_list(1), x2sys_put(1), x2sys_report(1)

GMT 4.5.7							    15 Jul 2011 						 X2SYS_MERGE(1gmt)
All times are GMT -4. The time now is 11:56 AM.
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