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my %file1_row_for;
while (my $input = <THAT_FILE>){
...
    my ( undef, $id ) = split /;/, $input;
    my $file1_row_for{$id} = $input;
}

while ( my $input = <THAT_OTHER_FILE> ){
    my ( $id2 ) = split /;/, $input;
...
    print OUTFILE ';' . $file1_row_for{$id2} if defined $file1_row_for
+{$id2}
    print OUTFILE "\n";
}

perl -e 'split//,q{john hurl, pest caretaker}and(map{print @_[$_]}(joi
+n(q{},map{sprintf(qq{%010u},$_)}(2**2*307*4993,5*101*641*5261,7*59*79
+*36997,13*17*71*45131,3**2*67*89*167*181))=~/\d{2}/g));'