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Full Discussion: Sort with UNIX
Top Forums Shell Programming and Scripting Sort with UNIX Post 302463703 by ctsgnb on Monday 18th of October 2010 08:29:12 AM
Old 10-18-2010
Quote:
Originally Posted by Scrutinizer
Like this?
Code:
$ awk '$7>M[$1]{M[$1]=$7;A[$1]=$0}END{for(i in A)print A[i]}' infile427
KW005 KW0051010180950 101018 0950 0956 1010180950 1010180956
OG010 OG0101010181002 101018 1002 1123 1010181002 1010181123
ED011 ED0111010180949 101018 0949 1201 1010180949 1010181201
ED006 ED0061010180949 101018 0949 0956 1010180949 1010180956
AD008 AD0081010180947 101018 0947 1014 1010180947 1010181014
ED007 ED0071010180949 101018 0949 0956 1010180949 1010180956

OMG awk is darn powerful ... i really should get deeper into it

Could someone kindly comment the code pls ?
1. do awk execute M[$1]=$7 before the checking condition $7>M[$1] ?
2. for(i in A)print A[i] i doesn't need to be initialized ? it automatically scan the A array ?
3. how does it know which [$1] index value to take to scan this array ?

Thanks in advance for you lightening

Last edited by ctsgnb; 10-18-2010 at 09:52 AM..
 

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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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