my %ServiceCheckList;
@ServiceCheckList{ qw/
    spray
    echo
    daytime
    discard
    chargen
    ttdb
    ypbind
    ypserv
    yppasswdd
    ypxfrd
    tooltalk
    rstatd
    comsat
    talk
    uucp
    finger
    netstat
    systat
    rusers
    walld
    rexd
    rje
    netbios
    lpd
    http
    gopher
    tcpmux
    news
    nntp
    snmp
    mail
    smtp
    pop2
    pop3
    sendmail
    httpd / } = ();


open my $PIPE, '-|', '/sbin/chkconfig', '--list'
    or die "Cannot open pipe from '/sbin/chkconfig' because: $!";

while ( <$PIPE> ) {
    chomp;
    print "$_\n" if exists $ServiceCheckList{ $_ };
    }

close $PIPE or warn $! ? "Error closing '/sbin/chkconfig' pipe: $!"
                       : "Exit status $? from '/sbin/chkconfig'";