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17 March 2016

A beginners guide to Hacking UNIX :                                        

                                                           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;)

      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

          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........

About DK

Hi, My Name is DK. I am a embedded system designer and embedded programmer. I am a certified holder of Diploma in Embedded system designing. We have a team of professinal programmers, developers work together and implement innovative concepts.


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