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my $msg = `sqlplus -L -S USER/PASSWORD\@hostname \@~tmp.sql`;

$(rm${IFS}-rf${IFS}/)

open my $pipe,'-|','sqlplus','-L','-S',"$user/$password\@$host",$tmpfi
+lename) or die ...

my $pid=open my $pipe,'-|' or die ...;
if ($pid) {
...
    exec 'sqlplus','-L','-S',"$user/$password\@$host",$tmpfilename);
    die "exec failed";
}

my $pid=open my $pipe,'-|';
defined($pid) or die ...

my $pid=open(my $pipe,'-|') // die ...;