To help you with improving your Perl technique, some minor Perl style advice on your originally posted code:

• Always start your scripts with "use strict" and "use warnings"
• You don't need to quote "$tmpfile" in your open call
• Your use of split on newline is pointless; you're reading line-by-line and have already chomp'ed the newline
• Prefer the close function to the ->close method call

That is, I would write your originally posted code:

open my $fh1, "<:encoding(utf-8)","$tmpfile" or die "$tmpfile: $!";
while (<$fh1>) {
    chomp;
    push @names, split (/\n/);
}
$fh1->close;
[download]

as:

use strict;
use warnings;
my $tmpfile = 'f.tmp'; # test file used only for testing this script s
+tandalone
my @names;
open my $fh1, "<:encoding(utf-8)", $tmpfile or die "$tmpfile: $!";
while (<$fh1>) {
    chomp;
    push @names, $_;
}
close $fh1;
[download]

That said, I strongly endorse the other comments exhorting you to write the whole thing in Perl without using Unix shell at all.
As for why, see: Unix shell versus Perl

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