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Full Discussion: Sort with conditions
Top Forums Shell Programming and Scripting Sort with conditions Post 302967732 by Don Cragun on Saturday 27th of February 2016 09:08:40 AM
Old 02-27-2016
Hi jiam912,
Interesting solution.

Still no sort, but this also seems to work:
Code:
#!/bin/ksh
awk '
$3 <= 1 && $4 <= 6.26 && (!($1 in f1) || $7 > f[$1]) {
	f1[$1] = $0
	f7[$1] = $7
}
($3 > 1 || $4 > 6.26) && !($1 in f1) && (!($1 in d1) || $7 > d7[$1]) {
	d1[$1] = $0
	d7[$1] = $7
}
END {	for(k in f1)
		print f1[k]
	for(k in d1)
		if(!(k in f1))
			print d1[k]
}' input

The f*[] arrays gather the records with the largest column 7 value for each column 1 value ignoring records that have values in columns 3 or 4 that are out of range (just like in my previous script, but with the logic reversed).

The d*[] arrays gather an abbreviated list of the records with the largest column 7 value for each column 1 value only for records that have values in columns 3 or 4 that are out of range. (I say abbreviated because after it encounters a record where a column 1 value has been found where columns 3 and 4 are in range, it stops gathering data for records where columns 3 or 4 are out of range.)

At the end it prints the accumulated f1[] array entries and then prints the accumulated d1[] array entries that didn't have an overriding entry in f1[].

It still just needs one process to do the work and still only needs to read the input once.

Hope this helps.
Last edited by Don Cragun; 02-27-2016 at 10:10 AM.. Reason: Fix auto spell-check fix error.
This User Gave Thanks to Don Cragun For This Post:
jiam912
 

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LEARN ABOUT DEBIAN

tv_sort

TV_SORT(1p)						User Contributed Perl Documentation					       TV_SORT(1p)

NAME

       tv_sort - Sort XMLTV listings files by date, and add stop times.

SYNOPSIS

       tv_sort [--help] [--by-channel] [--output FILE] [FILE...]

DESCRIPTION

       Read XMLTV data and write out the same data sorted in date order.  Where stop times of programmes are missing, guess them from the start
       time of the next programme on the same channel. For the last programme of a channel, no stop time can be added.

       Tv_sort also performs some sanity checks such as making sure no two programmes on the same channel overlap.

       --output FILE write to FILE rather than standard output

       --by-channel sort first by channel id, then by date within each
		       channel.

       --duplicate-error If the input contains the same programme more than once,
			    consider this as an error. Default is to silently
			    ignore duplicate entries.

       The time sorting is by start time, then by stop time.  Without --by-channel, if start times and stop times are equal then two programmes
       are sorted by internal channel id.  With --by-channel, channel id is compared first and then times.

       You can think of tv_sort as converting XMLTV data into a canonical form, useful for diffing two files.

EXAMPLES

       At a typical Unix shell or Windows command prompt:

       tv_sort <in.xml >out.xml
       tv_sort in.xml --output out.xml

       These are different ways of saying the same thing.

AUTHOR

       Ed Avis, ed@membled.com

perl v5.14.2							    2006-03-02							       TV_SORT(1p)
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