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Sys::Hostname::Long(3) User Contributed Perl Documentation Sys::Hostname::Long(3)

NAME

Sys::Hostname::Long - Try every conceivable way to get full hostname

SYNOPSIS

    use Sys::Hostname::Long;
    $host_long = hostname_long;

DESCRIPTION

How to get the host full name in perl on multiple operating systems (mac, windows, unix* etc)

DISCUSSION

This is the SECOND release of this code. It has an improved set of tests and improved interfaces - but it is still often failing to get a full host name. This of course is the reason I wrote the module, it is difficult to get full host names accurately on each system. On some systems (eg: Linux) it is dependent on the order of the entries in /etc/hosts.

To make it easier to test I have testall.pl to generate an output list of all methods. Thus even if the logic is incorrect, it may be possible to get the full name.

Attempt via many methods to get the systems full name. The Sys::Hostname class is the best and standard way to get the system hostname. However it is missing the long hostname.

Special thanks to David Sundstrom and Greg Bacon for the original Sys::Hostname

SUPPORT

This is the original list of platforms tested.

        MacOS           Macintosh Classic               OK
        Win32           MS Windows (95,98,nt,2000...)
                        98                              OK
        MacOS X         Macintosh 10                    OK
                        (other darwin)                  Probably OK (not tested)
        Linux           Linux UNIX OS                   OK
                        Sparc                           OK
        HPUX            H.P. Unix 10?                   Not Tested
        Solaris         SUN Solaris 7?                  OK (now)
        Irix            SGI Irix 5?                     Not Tested
        FreeBSD         FreeBSD                         OK

A new list has now been compiled of all the operating systems so that I can individually keep information on their success.

THIS IS IN NEED OF AN UPDATE AFTER NEXT RELEASE.

Mac OS - Not yet tested
Mac OS X - OK 20040315 (v1.1)
4 - Not yet tested
6 (Neutrino) - Not yet tested
3.1 - Not yet tested
95 - Not yet tested
98 - Not yet tested
2000 - Not yet tested

KNOWN LIMITATIONS

Unix

Most unix systems have trouble working out the fully qualified domain name as it to be configured somewhere in the system correctly. For example in most linux systems (debian, ?) the fully qualified name should be the first entry next to the ip number in /etc/hosts

        192.168.0.1     fred.somwhere.special   fred

If it is the other way around, it will fail.

Mac

TODO

Contributions

        David Dick
        Graeme Hart
        Piotr Klaban
        * Extra code from G
        * Dispatch table
        * List of all operating systems.

Solaris * Fall back 2 - TCP with DNS works ok * Also can read /etc/defaultdomain file

SEE ALSO

        L<Sys::Hostname>

AUTHOR

Originally by Scott Penrose <scottp@dd.com.au>

Contributions: Michiel Beijen <michiel.beijen@gmail.com>

COPYRIGHT

Copyright (c) 2001,2004,2005,2015 Scott Penrose. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

2017-07-12 perl v5.40.0