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A Beginners Guide to Hacking Un*x
NOTICE: TO ALL CONCERNED Certain text files and messages contained on this site deal with activities and devices which would be in violation of various Federal, State, and local laws if actually carried out or constructed. The webmasters of this site do not advocate the breaking of any law. Our text files and message bases are for informational purposes only. We recommend that you contact your local law enforcement officials before undertaking any project based upon any information obtained from this or any other web site. We do not guarantee that any of the information contained on this system is correct, workable, or factual. We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
**************************************
* A beginners guide to: *
* H A C K I N G *
* *
* U N I X *
* *
* By Jester Sluggo *
* Written 10/08/85 *
**************************************
In the following file, all references made to the name Unix, may also be
substituted to the Xenix operating system.
Brief history: Back in the early sixties, during the development of third
generation computers at MIT, a group of programmers studying the potential of
computers, discovered their ability of performing two or more tasks
simultaneously. Bell Labs, taking notice of this discovery, provided funds for
their developmental scientists to investigate into this new frontier. After
about 2 years of developmental research, they produced an operating system they
called "Unix".
Sixties to Current: During this time Bell Systems installed the Unix system
to provide their computer operators with the ability to multitask so that they
could become more productive, and efficient. One of the systems they put on the
Unix system was called "Elmos". Through Elmos many tasks (i.e. billing,and
installation records) could be done by many people using the same mainframe.
Note: Cosmos is accessed through the Elmos system.
Current: Today, with the development of micro computers, such multitasking
can be achieved by a scaled down version of Unix (but just as powerful).
Microsoft,seeing this development, opted to develop their own Unix like system
for the IBM line of PC/XT's. Their result they called Xenix (pronounced
zee-nicks). Both Unix and Xenix can be easily installed on IBM PC's and offer
the same functions (just 2 different vendors).
Note: Due to the many different versions of Unix (Berkley Unix, Bell System
III, and System V the most popular) many commands following may/may not work. I
have written them in System V routines. Unix/Xenix operating systems will be
considered identical systems below.
How to tell if/if not you are on a Unix system: Unix systems are quite common
systems across the country. Their security appears as such:
Login; (or login;)
password:
When hacking on a Unix system it is best to use lowercase because the Unix
system commands are all done in lower- case.
Login; is a 1-8 character field. It is usually the name (i.e. joe or fred)
of the user, or initials (i.e. j.jones or f.wilson). Hints for login names can
be found trashing the location of the dial-up (use your CN/A to find where the
computer is).
Password: is a 1-8 character password assigned by the sysop or chosen by the
user.
Common default logins
--------------------------
login; Password:
root root,system,etc..
sys sys,system
daemon daemon
uucp uucp
tty tty
test test
unix unix
bin bin
adm adm
who who
learn learn
uuhost uuhost
nuucp nuucp
If you guess a login name and you are not asked for a password, and have
accessed to the system, then you have what is known as a non-gifted account. If
you guess a correct login and pass- word, then you have a user account. And,
if you guess the root password, then you have a "super-user" account. All Unix
systems have the following installed to their system: root, sys, bin, daemon,
uucp, adm
Once you are in the system, you will get a prompt. Common prompts are:
$
%
#
But can be just about anything the sysop or user wants it to be.
Things to do when you are in: Some of the commands that you may want to try
follow below:
who is on (shows who is currently logged on the system.)
write name (name is the person you wish to chat with)
To exit chat mode try ctrl-D.
EOT=End of Transfer.
ls -a (list all files in current directory.)
du -a (checks amount of memory your files use;disk usage)
cd\name (name is the name of the sub-directory you choose)
cd\ (brings your home directory to current use)
cat name (name is a filename either a program or documentation your username
has written)
Most Unix programs are written in the C language or Pascal since Unix is a
programmers' environment.
One of the first things done on the system is print up or capture (in a
buffer) the file containing all user names and accounts. This can be done by
doing the following command:
cat /etc/passwd
If you are successful you will a list of all accounts on the system. It
should look like this:
root:hvnsdcf:0:0:root dir:/:
joe:majdnfd:1:1:Joe Cool:/bin:/bin/joe
hal::1:2:Hal Smith:/bin:/bin/hal
The "root" line tells the following info :
login name=root
hvnsdcf = encrypted password
0 = user group number
0 = user number
root dir = name of user
/ = root directory
In the Joe login, the last part "/bin/joe " tells us which directory is his
home directory (joe) is.
In the "hal" example the login name is followed by 2 colons, that means that
there is no password needed to get in using his name.
Conclusion: I hope that this file will help other novice Unix hackers obtain
access to the Unix/Xenix systems that they may find. There is still wide growth
in the future of Unix, so I hope users will not abuse any systems (Unix or any
others) that they may happen across on their journey across the electronic
highways of America. There is much more to be learned about the Unix system
that I have not covered. They may be found by buying a book on the Unix System
(how I learned) or in the future I may write a part II to this........
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