Super Dimension Fortress (SDF, also known as freeshell.org) is a non-profit public access UNIX shell provider on the Internet. It has been in continual operation since 1987 as a non-profit social club.

SDF provides free Unix shell access, web hosting and many other features at the user membership level. Additional programs, capabilities and resources are available at “patron” and “sustaining” level memberships, which are granted with one-time or recurring dues in support of the SDF system.

The SDF network of systems that serves its membership currently includes NetBSD servers for regular use (running on DEC Alpha- and AMD Opteron-powered hardware) as well as retrocomputing environments: a TWENEX system running the Panda Distribution TOPS-20 MONITOR 7.1 on two XKL TOAD-2 computers,[2][3] a Symbolics Genera system, and an ITS system[4] . 
– above information is from Wikipedia. 

Websites

  • https://sdf.org/ –  SDF Public Access UNIX System .. Est. 1987
  • http://freeshell.de – Public access Linux system. Your non-profit shell provider since 2002.
Online Access Server through Gate One Web SSH Client
  • https://ssh.sdf.org:4443/

Register an account

 

Log In

After registered an account, you will be able to use your own or online ssh client to log into it. 


    ┌──────────────────────────────────────────────────────────────────────┐
    │               • MobaXterm Professional Edition v22.1 •               │
    │               (SSH client, X server and network tools)               │
    │                                                                      │
    │ ⮞ SSH session to [email protected]    │   • Direct SSH      :  ✓                                             │
    │   • SSH compression :  ✓                                             │
    │   • SSH-browser     :  ✓                                             │
    │   • X11-forwarding  :  ✗  (disabled or not supported by server)      │
    │                                                                      │
    │ ⮞ For more info, ctrl+click on help or visit our website.            │
    └──────────────────────────────────────────────────────────────────────┘
[ 'jy' will expire in 365 days - Please 'validate' your account soon ]
Please press your BACKSPACE key:

Here are some outputs after logged in.

    ┌──────────────────────────────────────────────────────────────────────┐
    │               • MobaXterm Professional Edition v22.1 •               │
    │               (SSH client, X server and network tools)               │
    │                                                                      │
    │ ⮞ SSH session to [email protected]                                 │
    │   • Direct SSH      :  ✓                                             │
    │   • SSH compression :  ✓                                             │
    │   • SSH-browser     :  ✓                                             │
    │   • X11-forwarding  :  ✗  (disabled or not supported by server)      │
    │                                                                      │
    │ ⮞ For more info, ctrl+click on help or visit our website.            │
    └──────────────────────────────────────────────────────────────────────┘
[ ‘jy’ will expire in 365 days – Please ‘validate’ your account soon ]
Please press your BACKSPACE key:
=======================================================================
SDF host uptime report for Seattle WA, Dallas TX (USA) and Germany (EU)
             Please use ‘tty.sdf.org’ for general access
=======================================================================
SERVER          DAYS+HOUR:MIN       USERS   MACHINE LOAD
———————————————————————-
9p             up  26+21:54,   16 users,  load:   0.00,   0.00,   0.00
aNONradio      up  134+6:00,   24 users,  load:   0.16,   0.17,   0.15
beastie        up  42+12:10,   18 users,  load:   0.00,   0.01,   0.00
faeroes        up 134+00:12,   69  user,  load:   0.20,   0.24,   0.24
iceland        up 134+00:04,   51 users,  load:   0.26,   0.28,   0.27
jitsi          up  32+22:55,    4 users,  load:   0.00,   0.00,   0.00
ma             up  63+16:14,   85 users,  load:   3.91,   3.54,   3.53
mastodon       up 139+21:33,  862 users,  load:   1.85,   1.92,   2.06
matrix         up  11+22:07,  227 users,  load:   0.70,   0.41,   0.51
mc             up  63+16:20,    2 users,  load:   3.46,   3.50,   3.52
miku           up 108+23:07,    3 users,  load:   3.85,   3.63,   3.66
mx             up 120+21:09,  334 users,  load:   1.98,   1.79,   1.47
norge          up  42+12:19,   85 users,  load:   0.09,   0.08,   0.08
otaku          up 134+00:00,   42 users,  load:   0.31,   0.21,   0.22
rie            up 133+23:57,  202  user,  load:   0.52,   0.57,   0.57
sdf            up  20+18:57,  137 users,  load:   0.63,   0.67,   0.80
sdfeu          up  98+11:21,  133 users,  load:   2.69,   2.60,   2.58
sverige        up  42+12:21,   26 users,  load:   0.09,   0.11,   0.08
vps3           up  221+1:45,   20 users,  load:   3.70,   2.11,   1.38
vps9           up  81+16:46,    9 users,  load:   0.00,   0.00,   0.00
                             2349 total
(continue)
The Moon is Waning Gibbous (78% of Full)
                 .———-
             .–‘  o     . .
          .-‘   .    O   .
       .-‘@   @@@@@@@   .  @@@@@
      /@@@  @@@@@@@@@@@   @@@@@@@
    ./    o @@@@@@@@@@@   @@@@@@@
   /@@  o   @@@@@@@@@@@.   @@@@@@@
  /@@@@   .   @@@@@@@o    @@@@@@@@@@
  |@@@@@               . @@@@@@@@@@@
 /@@@@@  O  `.-./  .      @@@@@@@@@@@    Full Moon +
 | @@@@    –`-‘       o     @@@@@@@@    4 18:23:38
 |@ @@@        `    o      .  @@   .     Last Quarter –
 |       @@  @         .-.     @@@       3  1:57:43
 \  . @        @@@     `-‘   . @@@@
  |      @@   @@@@@ .           @@
  \     @@@@  @\@@    /  .  O    .
   \  o  @@     \ \  /         .
    `\     .    .\.-.___   .      .
      \           `-‘
       `-.   o   / |     o    O
          `-.   /     .       .
             `–.       .
                 `———-
(continue)
[09-Sep-22 17:47:51 abortretryfail      abortretryfail                         EL87]
% Greetings from the Mac Color Classic. 🙂
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[12-Sep-22 00:25:04  slothrop           mobb_solo               N. Loop Austin]
% Live Music @ Monkeywrench Booksellers 8pm ▒🧨
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[18-Sep-22 05:05:57      qiqi Kusanalika Xamarin (initial)                             ]
% Thanks for this. Well I use Indonesia main language using script and not all use Indonesia main language. Memang agak sulit untuk menerjemahkan.
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[23-Sep-22 11:20:54  claudiom            claudiom                         work]
% Happy Friday from UTC-4!
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[23-Sep-22 14:58:35 charmquark          charmquark                        Earth]
% Running my own unix server… nevermore?
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[27-Sep-22 14:40:26    unixen              Unixen            The last Frontier]
% Wish I had found this a long time ago, but glad I am here now
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[02-Oct-22 21:30:21 billybigbagels               Billy              Los Angeles, CA]
% It was a fun ride Overwatch 1, you will be missed…
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[03-Oct-22 14:21:07    skylar              skylar                             ]
% command line!
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[03-Oct-22 17:29:55       isk                 isk                  Los Angeles]
% The trap appears to be disarmed.
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[06-Oct-22 05:03:22    geoffo        Geoff Oliver         Colorado Springs, CO]
% Very cool stuff!!!
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[07-Oct-22 08:48:31 devhackvps          devhackvps             The End Of Space]
% lol free email address + free computer
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[09-Oct-22 04:09:32 burgertron              cheesy              server ‘closet’]
% got a server with a buttload of ram, getting freebsd going with samba and doing apple mdm stuff, may write something
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[09-Oct-22 09:13:02 tusharhero          tusharhero                        India]
% Hello I am under water here too much raininig 😭
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[09-Oct-22 14:00:29 tusharhero Depressed JEE aspirant                        India]
% I have been trying to complete my homeowrk for 6 hours now
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[09-Oct-22 14:20:54    railey                 ree                     Internet]
% what’s the meaning of life?
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[10-Oct-22 13:48:30 abortretryfail      AbortRetryFail                         EL87]
% What is love? Baby don’t hurt me… Don’t hurt me, no more.
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
[13-Oct-22 14:17:24    cberce               Chris          Zurich, Switzerland]
% gruezi mitanand 🙂
7304 guestbook entries.
Type ‘help’ for Commands.
Type ‘com’ to chat with other users.
Type ‘ttytter’ to listen to Twitter Tweets anonymously.
Type ‘mud’ to play the SDFmud.
Type ‘mkhomepg’ to set up your personal website.
Did you know you can become a permanent LIFETIME member of SDF
by making a onetime donation of $36?  Type ‘arpa’ for more info!
faeroes:/sdf/udd/j/jon>


Commands

You can easily use help command to get the list for all available commands:

faeroes:/sdf/udd/j/jo> help
SDF psh Version 8 - *PREVALIDATED SHELL ACCOUNT*

 what         - what can I use this account for?
 unix         - a listing of UNIX commands available to you NOW
 how          - information on increasing membership
 teach        - using SDF in a classroom setting
 dialup       - information about SDF dialup service
 arpa         - about lifetime arpa membership
 bboard       - sdf user message boards
 commode      - chat with other users online
 ysm          - chat on the ICQ network
 bsflite      - chat on the AIM network
 msnre        - chat on the MSN network
 ttytter      - listen to Twitter tweets anonymously
 lynx         - browse the WWW textually or access GOPHER
 bksp         - set your BACKSPACE key
 software     - display software programs installed on the system
 quote        - get a real time stock quote
 games        - a listing of available games
 thxmoo       - connect to the THXMOO
 mud          - connect to the SDFmud
 validate     - gain additional shell access (also try 'user' for details)

faeroes:/sdf/udd/j/jo>
faeroes:/sdf/udd/j/jo> unix
UNIX command summary

 cd         {dir}  - Change Directory
 pwd               - print working (current) directory
 ls                - LiSt directory  (try ls -la)
 cat        {file} - conCATenate (view) a file
 mkdir      {name} - create a directory
 rm         {file} - remove a file or directory
 mv         {file) - move a file or directory
 chmod perm {file} - set permission bits for a file or directory
 edit       {file} - edit a file in your directory
 ps                - Process Status (try ps -aux)
 passwd            - Change your password
 disk              - show current disk usage
 uptime            - show system status
 df                - print system storage
 freeirc           - IRC access is free on Sundays
 profiles          - Join the ASCII social network
 dict       {word} - query the online dictionary
 cal               - calendar (try 'cal 1752')
 finger     {user} - show info about a user (try who or w)
 chfn              - change your full name
 chsh              - change your shell
 ping       {host} - test network connectivity to a host
 traceroute {host} - view the route to a remote host
 man         {cmd} - read a manual page for a command.
 dig / host        - DNS utilities
 geoip             - Country lookup on an IP
 expire            - calculate your account expiration
 domains           - list domains available for use on SDF
 mkhomepg          - manage your own webpage space
 mkgopher          - manage your own gopherspace
 upload            - upload a file using ZMODEM (works w/ TeraTERM)
 com               - multiuser online chat
 msg        {user} - send a message to another user online
 bboard            - bulletin board
 faq               - frequently asked questions
 mail              - read/send email (also try http://webmail.freeshell.org)
 lynx        {url} - browse webpages
 links       {url} - browse webpages (w/ frames support)
 gopher      {url} - browse gopherspace
 talk       {user} - talk to another user
 url        {user} - look up a user's URL
 ysm               - chat on the ICQ network
 pkg_info          - list ported/installed software packages
 whois    {domain} - query the INTERNIC WHOIS database
 logout            - logoff
faeroes:/sdf/udd/j/jo> df -h
Filesystem         Size       Used      Avail %Cap Mounted on
/dev/wd0a           35G       1.9G        32G   5% /
nol1:/sdf           23T       6.5T        16T  29% /sdf
ptyfs              1.0K       1.0K         0B 100% /dev/pts
faeroes:/sdf/udd/j/jo>

Change Password

 

faeroes:/sdf/udd/j/jo> passwd
Trying 10.0.0.22...
Connected to nol1.
Escape character is 'off'.

NetBSD/amd64 (mx) (pts/3)

login:
                                                                     
SDF ACCOUNT MAINTENANCE INTERFACE - (use 'tty.sdf.org' for LOGIN access)
                                                                                                                                                                                                                                                                   
p - change your password
s - change your shell
f - configure your PUBLIC FINGER display (finger [email protected])
g - configure your NON-PUBLIC GECOS field (Fullname, Office, Phone ..)
a - setup automatic password recovery
e - an external contact email address for dues and system notices
o - manage optional account features and social networking
m - reset your MySQL password(s)
w - reset webmail preferences
v - set or reset your VoIP SIP id
                                                                                                                                                                                                                                                                   
q - quit
                                                                                                                                                                                                                                                                   
(main) Your Choice: Changing local password for jon.
Old password:
New password:
Retype new password:
% Successful - NOTE! THE CLIENTS WILL UP DATE SHORTLY.
               BE PATIENT AND ALLOW THE UPDATE TO OCCUR.
                                                                                                                                                                                                                                                                   
(continue)

There are lots of limitation for free user to use those features or fuctions, such as change your shell. If you are trying to do that, it will require you validate your account first. Validate basically means a minimum donation, $1 USD by mail or $3 USD by Paypal. 

Resources

 

Videos

 

By netsec

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