Once the @fields array is declared inside the loop, you can safely destroy it:
while ( my $line = <DATA> ) {
chomp $line;
my @fields = qw( login uid gid name home
+ shell );
my @items =
$line =~ /^([\-\w]+):x:(\d+):(\d+):([\-\w\s\(\)\,]*):([\w\/]+)
+:([\w\/]+)$/
or die "Malformed input [$line]";
push @users, {};
$users[-1]{ shift @fields } = shift @items while @fields;
}
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