Here's an option to consider:

use Modern::Perl;
use File::Slurp qw/read_file write_file/;

my $test     = 'test.txt';
my $test2    = 'test2.txt';
my $activout = 'ActivACNPF.txt';
my @lines;

my %data = map { /(.+)\s+\|\s+(.+)/; $1 => $2 } read_file $test2;

for ( read_file $test ) {
    /(.+)\s+.+=([^\s]+)/;
    push @lines, "$1 $2 $data{$1}\n" if $data{$1};
}

write_file $activout, @lines;

[download]

Output to file:

Q197F8 IIV3-002R PF04947.9
Q91G88 IIV6-006L PF01486.12 PF00319.13

[download]

%data is initialized using the captured data from test2.txt as key/value pairs. Next, the 'keys' and associated 'values' are captured from test.txt, and the completed line is push onto @lines if a matching key is found. Finally, @lines is written to ActivACNPF.txt.

Hope this helps!

Update: Replaced a single-line map with a multi-line for to improve readability.

In reply to Re: Help with pushing into a hash by Kenosis
in thread Help with pushing into a hash by jemswira

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