I generally try to avoid operating on @_ and $_ wherever possible, to avoid confusion and pitfalls like what you may be experiencing. Here's some code I whipped up that I think does the operation you desire but in a slightly different way.
#!/usr/bin/perl
use strict;
use warnings;
my $var = '';
my @array = ();
foreach my $line (<DATA>) {
chomp $line;
@array = split(/\t/,$line);
$var = $array[0]; #<- not necessary, but wanted to mimic OP's code
print "$var\n";
}
exit;
__DATA__
1 4 8 9
23 432 23 21
98 87 4 32
Does that help any?
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