$ libnetcfg
    # old config ./libnet.cfg
    daytime_hosts        ntp1.none.such
    ftp_int_passive      0
    ftp_testhost         ftp.funet.fi
    inet_domain          none.such
    nntp_hosts           nntp.none.such
    ph_hosts             
    pop3_hosts           pop.none.such
    smtp_hosts           smtp.none.such
    snpp_hosts           
    test_exist           1
    test_hosts           1
    time_hosts           ntp.none.such
    # libnetcfg -h for help
    $
It tells where the old configuration file was found (if found).
The "-h" option will show a usage message.
To change the configuration you will need to use either the "-c" or the "-d" options.
The default name of the old configuration file is by default ``libnet.cfg'', unless otherwise specified using the -i option, "-i oldfile", and it is searched first from the current directory, and then from your module path.
The default name of the new configuration file is ``libnet.cfg'', and by default it is written to the current directory, unless otherwise specified using the -o option, "-o newfile".
Jarkko Hietaniemi, conversion into libnetcfg for inclusion into Perl 5.8.