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my %filehandles;
sub open_file {
...
print $fh "Hello\n";
my $fh2 = open_file( 'path1' );
print $fh2 "world!\n";

my @services = `systemctl list-unit-files`;
if( my @smb = grep { /smb\.service/ } @services ) {
...
    print DATEI "chkconfig smb: OK\n";
    print DATEI "Output:_\n " . join( "", @smb) . \n\n;
};