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#!/usr/bin/perl | |
use 5.10.0; | |
use strict; | |
use warnings; | |
use Tie::File; | |
my $MAX_LINES = 100_000; | |
my @FIELDS = (7, 8, 9, 14, 17, 18, 19, 25, 30, 31, 35, 36, 37, 43, 44, 46, 47, 50, 52, 55, 62, 63, 66, 67, 68, 75, 76, 77, 81); | |
sub nextfilename { | |
my $num = shift; | |
return "data$num.txt"; | |
} | |
sub getdatafields { | |
my $line = shift @_; | |
my @fields = @_; | |
my @F = split /\|/, $line; | |
return join "|", @F[@fields]; | |
} | |
my $infilename = shift @ARGV or die "no input specified"; | |
my @inputdata; | |
tie(@inputdata, 'Tie::File', $infilename) or die "can't open data file"; | |
my $outfile; | |
open($outfile, ">", nextfilename( 0 )) | |
or die "can't open " . nextfilename(0) . " for writing"; | |
my $header_row = getdatafields(shift(@inputdata), @FIELDS); | |
print $outfile $header_row; | |
for(my $i = 1; $i <= $#inputdata; $i++) { | |
my $line = $inputdata[$i]; | |
if (($i % $MAX_LINES) == 0) { | |
my $k = int($i/$MAX_LINES); | |
my $l = $i - 1; | |
print "working on file ". $k . "starting at observation # " . $l . "\n"; | |
close $outfile; | |
open($outfile, ">", nextfilename( int($i/$MAX_LINES) )) or die "can't open " . nextfilename(int($i/$MAX_LINES)) . " for writing"; | |
print $outfile $header_row; | |
} | |
say $outfile getdatafields($line, @FIELDS); | |
} | |
close $outfile; |
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