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Top Forums Shell Programming and Scripting AWK script to create max value of 3rd column, grouping by first column Post 302655029 by rangarasan on Tuesday 12th of June 2012 03:46:52 PM
Old 06-12-2012
awk

Hi,
Try this one,
Code:
awk 'BEGIN{FS=",";}{if(a[$1]<$3){a[$1]=$3;}}END{for(i in a){print i","a[i];}}' file|sort -t',' -k1,1

if you are using gawk, make you of asort function to sort the array a and ignore the sort cmd..
Cheers,
Ranga:-)

Last edited by rangarasan; 06-12-2012 at 05:02 PM.. Reason: typo
This User Gave Thanks to rangarasan For This Post:
 

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Test::use::ok(3)					User Contributed Perl Documentation					  Test::use::ok(3)

NAME
Test::use::ok - Alternative to Test::More::use_ok SYNOPSIS
use ok 'Some::Module'; DESCRIPTION
According to the Test::More documentation, it is recommended to run "use_ok()" inside a "BEGIN" block, so functions are exported at compile-time and prototypes are properly honored. That is, instead of writing this: use_ok( 'Some::Module' ); use_ok( 'Other::Module' ); One should write this: BEGIN { use_ok( 'Some::Module' ); } BEGIN { use_ok( 'Other::Module' ); } However, people often either forget to add "BEGIN", or mistakenly group "use_ok" with other tests in a single "BEGIN" block, which can create subtle differences in execution order. With this module, simply change all "use_ok" in test scripts to "use ok", and they will be executed at "BEGIN" time. The explicit space after "use" makes it clear that this is a single compile-time action. SEE ALSO
Test::More CC0 1.0 Universal To the extent possible under law, XX has waived all copyright and related or neighboring rights to Test-use-ok. This work is published from Taiwan. <http://creativecommons.org/publicdomain/zero/1.0> POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 45: Non-ASCII character seen before =encoding in 'XX'. Assuming UTF-8 perl v5.18.2 2012-09-11 Test::use::ok(3)
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