Bash script search, improve performance with large files Post: 303032995

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Top Forums Shell Programming and Scripting Bash script search, improve performance with large files Post 303032995 by SDohmen on Thursday 28th of March 2019 06:37:00 AM

03-28-2019

Registered User

Bash script search, improve performance with large files

Hello,

For several of our scripts we are using awk to search patterns in files with data from other files. This works almost perfectly except that it takes ages to run on larger files. I am wondering if there is a way to speed up this process or have something else that is quicker with the searching.

The part that i use is as follows:

Code:

awk -F";" '
NR==FNR         {id[$0]
                 next
                }
                {for (SP in id) if (tolower($0) ~ SP)    {print > "'"$PAD/removed_woord.csv"'"
                                                 next
                                                }
                }
                {print > "'"$PAD/filtered_winnaar_2.csv"'"
                }
' $PAD/prijslijst_filter.csv $PAD/lowercase_winnaar.csv

I got this piece of programming also from this forum but i added the tolower part myself since not always it seem to get all results from the main file. 1 important part is that the results from filtering need to be saved in another file. The filtered file only contains the not found lines of course.

Last edited by joeyg; 04-04-2019 at 09:58 AM..

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LEARN ABOUT DEBIAN

igawk

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)