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Full Discussion: awk to parse huge files
Top Forums Shell Programming and Scripting awk to parse huge files Post 302852719 by panyam on Thursday 12th of September 2013 09:25:06 AM
Old 09-12-2013
awk to parse huge files

Hello All,

I have a situation as below:

(1) Read a source file (a single file of 1.2 million rows in it )
(2) Read Destination files one by one and replace the content ( few fields in it ) with the corresponding matching field from source file.

I tried as below: ( please note I am not posting the complete code and just a sue-do code )

Code:
awk -F"|" 'NR==FNR { array[$1]=$2;next } {gsub('fields in dest file',array[field positions in dest file]),$0 } 
source_file dest_files*.dat

The flaw in the above code is , irrespective of whether there is a matching string or not , the row is getting printed and performance is also not good.

Any suggestions would be appreciated.

Regards,
Ravi
 

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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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