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Full Discussion: minimum and maximum from columns
Top Forums Shell Programming and Scripting minimum and maximum from columns Post 302699489 by Don Cragun on Tuesday 11th of September 2012 08:33:46 PM
Old 09-11-2012
The following shell script should do what you want:
Code:
#!/bin/ksh
last1=
printlast() {
        if [ "x$last1" != x ]
        then
                printf "%s %s %s %s\n" "$last1" "$last2" "$last3" "$last4"
                last1=
        fi
}
while read in1 in2 in3 in4
do
        if [[ "x$in1" != "x$last1" || "x$in2" != "x$last2" ]]
        then    printlast
                last1="$in1"
                last2="$in2"
                last3="$in3"
                last4="$in4"
        else    if [ "$in3" -gt "$last3" ]
                then    last3="$in3"
                fi
        fi
done < in
printlast

There are lots of other ways to do this as well.

---------- Post updated at 05:33 PM ---------- Previous update was at 05:22 PM ----------

Quote:
Originally Posted by complex.invoke
Code:
awk '{if(a[$1FS$2]<$3)a[$1FS$2]=$3;if(!key[$1FS$2])key[$1FS$2]=$NF}END{for(i in a)print i,a[i],key[i]}' infile

This is one of the other ways to do it I mentioned in my last message. Note, however, that the order of the output lines is not guaranteed to be the same as in the input file when using awk this way. If maintaining the order is important, you would have to sort the output from this awk script or make the awk script more complex.
This User Gave Thanks to Don Cragun For This Post:
jacobs.smith
 

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LEARN ABOUT LINUX

mixer

MIXER(1)						  The Canonical Csound Reference						  MIXER(1)

NAME

       mixer - Mixes together a number of soundfiles. .

DESCRIPTION

       Mixes together a number of soundfiles, starting at different times and with individual channel selection from the input files.

SYNTAX

	   mixer [OPTIONS ... ] infile [[OPTIONS... ] infile] ...

INITIALIZATION

       Flags:

       o   -A = Generate an AIFF output file.

       o   -W = Generate an WAV output file.

       o   -h = Generate an output file with no header.

       o   -c = Generate 8-bit signed_char sound samples.

       o   -a = Generate alaw sound samples.

       o   -u = Generate ulaw sound samples.

       o   -s = Generate short integer sound samples.

       o   -l = Generate long (32 bit) integer sound samples.

       o   -f = Generate floating point samples.

       o   -F arg = Specifies the gain to be applied to the following input file. If arg is a floating point number that gain is applied uniformly
	   to the input. Alternatively it could be a file name which specifies a breakpoint file for varying the gain for different periods.

       o   -S integer = Indicate at which sample to start to mix in the next input file.

       o   -T fpnum = Indicate at which time (in seconds) to start to mix in the next input file.

       o   -1 = Mix in channel 1 from next sound file.

       o   -2 = Mix in channel 2 from next sound file.

       o   -3 = Mix in channel 3 from next sound file.

       o   -4 = Mix in channel 4 from next sound file.

       o   -^ intx inty = Mix in channel x from next sound file as channel y in the output.

       o   -v = Verbose mode.

       o   -R = Continually rewrite the header while writing soundfile (WAV/AIFF).

       o   -H integer = Show a "heart-beat" to indicate progress, in style 1, 2 or 3.

       o   -N = Alert call (usually ringing the bell) when finished.

       o   -o fname = output file name (default: test.wav)

EXAMPLES

       The default values are

	       mixer -s -otest -F 1.0 -S 0

       For example

	       mixer -F 0.96 in1.wav -S 300 -2 in2.aiff -S 300 -^4 1 in3.wav -o out.wav

       This creates a new sound file with a constant gain of 0.96 from in1.wav with the second channel of in2.aiff mixed in after 300 samples and
       channel 4 of in3.wav outpout as channel 1 after 300 samples.

CREDITS

       Author: John ffitch

       1994

AUTHORS

       Barry Vercoe
       MIT Media Lab

	   Author.

       Dan Ellis
       MIT Media Lab,
		 Cambridge
		 Massachussetts

	   Author.

COPYRIGHT

5.07								    06/23/2009								  MIXER(1)
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