Sorting - Help needed

My perl program parses data and outputs the relevant values I need into an array.
(code has a series of ifels conditions I check).

push (@array1,$var1, ",", $var2, ",", $var3, ",", $var4, ",", $var5, ",", $var6,"\n");


The output.csv file contains 6 columns, namely, var1, var2,....var6.
I need to sort my output.csv file first by $var4 and then by $var5. I would appreciate if you could:
1) Tell me what are the ways this can be achieved.

2) Code that would do this (with a brief explanation)


nathan_007Asked:
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FishMongerConnect With a Mentor Commented:
$var5 = sprintf("%05d", $var5);
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ozoCommented:
while( <> ){
my ($var1, $var2, $var3, $var4, $var5, $var6) = split/,/;
push @array,"$var4\0$var5\0$var1, $var2, $var3,  $var4, $var5, $var6\n";
}
@array = map{/.*\0(.*)/s}sort @array;
print @array;

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nathan_007Author Commented:
Thanks. In most cases $var4 and $var5 are 5 digit integers. However I enocuntered an issue when $var5 happened to be a 4 digit number.

10012, 3068 appeared after 10012, 10078

3068 needs to be as 03068 in the array.

How do I format $var4 and $var5 it in the array to be of 5 digits in length.....something similar to sprintf"%05d" ????
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Alkali_GuyCommented:
$var4 = "0".$var4 if (length($var4)==4);
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nathan_007Author Commented:
Alkali_Guy:
I agree that it works if the length is 4 digits. Is there a generic check I can do and round it to 5 digits assuming $var5 can be of length 1 or 2 or 3 or 4 or 5.
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ozoConnect With a Mentor Commented:
push @array,sprintf"%6d\0%6d\0%s\n",$var4,$var5,"$var1, $var2, $var3,  $var4, $var5, $var6";
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