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Top Forums Shell Programming and Scripting Sed or awk script to remove text / or perform calculations from large CSV files Post 302326271 by metronomadic on Wednesday 17th of June 2009 01:08:32 PM
Old 06-17-2009
Question Sed or awk script to remove text / or perform calculations from large CSV files

I have a large CSV files (e.g. 2 million records) and am hoping to do one of two things. I have been trying to use awk and sed but am a newbie and can't figure out how to get it to work. Any help you could offer would be greatly appreciated - I'm stuck trying to remove the colon and wildcards in sed, and the average sample I've found using awk is giving me values of around 4e08.

The CSV file looks like this:

Code:
Date,AIRCOMPRESSOR\FLARE_FLOW,AIRCOMPRESSOR\FLARE_TEMP
3/1/2008,1044.83215332,1090.88208008
3/1/2008 12:00:10 AM,1044.83215332,1090.88208008
3/1/2008 12:00:21 AM,1046.71142578,1090.88208008
3/1/2008 12:00:31 AM,1044.83215332,1090.88208008
3/1/2008 12:00:41 AM,1048.59057617,1083.96069336
3/1/2008 12:00:51 AM,1044.83215332,1083.96069336

I am hoping to either use sed or another script to remove the seconds portion of the data lines (i.e. remove ":10 AM" and all similar occurrences, or preferably to use awk to average the flow rates for each minute or each 15 minutes (i.e. the column right after the time).

Thanks in advance for any help you can offer.
 

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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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