A Basic UNIX Overview From Sudohackers.

A Basic UNIX Overview From Sudohackers.

A Basic UNIX Overview

Introduction to UNIX

One of the most common operating systems in existence is Unix. Unix exists in many different flavors, from Berkeley BSD to AT&T System V to SunOs. Basic working knowledge of Unix is almost essential to a hacker, as it is the system a hacker is most likely to come across. If you intend to use the internet at all, or to do any serious exploration of Telenet, the ability to navigate through Unix is a necessity. (Unix is also the single most interesting system in existence: it’s just fun to fuck with).

Unix Logins(A Basic UNIX Overview From Sudohackers.)

Most Unix logins look essentially the same. A general Unix login prompt looks something like this: connected to five.finger.com

That first line is the system identifier. Although it’s not at all essential to what you are doing, it’s good to know what system you are attempting to log on to. The second line is what typically identifies the system you are on as Unix. Almost all Unix systems greet a user with the same prompt:

Well, there’s not much to do in Unix from the outside, and Unix systems are typically fairly secure at this point. You may be able to obtain a list of users, or current users, by logging in as ‘who’, but other than that there are few functions available here. Unless you are on the internet or have accounts specifically for the specific machine you are on, the only way onto the system is to try
the default passwords.

What are the default passwords?

Unix systems come installed with certain passwords automatically. In addition, some accounts must exist on a system. One such account is
‘root’. This user is the divine Kami of the Unix system… in short, an all-access pass. Unfortunately, few systems allow root logins remotely, and even fewer leave ‘root’ unpassworded. Nevertheless, it’s
always worth a shot… try this:

connected to ren.stimpy.net
login: root
password: root
invalid login

well, nice try anyway,  other possible passwords for root include ‘sysadmin’, ‘sys’, ‘admin’… you get the idea. You may also want to try these passwords with a single-digit appended (added, idiot) to
them… meaning the password ‘root’ could be ‘root1’ or ‘root2’. An interesting tip about passwords in general… many people that use passwords under 8 characters tend to add a digit or a non-alphanumeric character to the password. This is done in order to hinder guessing and to stop password breakers (more on this later).

In this case, you may want to try adding a space before root… or even an ascii 255 to the end. Fortunately, there is more than one default password in a UNIX system… a quick list:

sys sys
bin bin
daemon daemon
rje rje
setup setup
uucp uucp/nuucp/anonymous
nuucp uucp/nuucp/anonymous
mountfsys mountfsys

In the System

Ok, at this point, I’m going to assume you’ve gotten past the login… as painful as that may sound. Although Unix may be secure from the outside, without effort from the system administrators, the inside of the system is not. First off, you’ll likely be asked for a terminal. vt100 serves your
purposes sufficiently, and it’s typically the default, so hit enter.

Now, hopefully, you have a prompt. There are many different types of UNIX prompts, some of which contain current directory information, some of which are just a single character. Just don’t panic when my examples don’t look exactly like what you’ve got on your screen. The first thing you *need* to do on the system is to establish your tty paramters. As eldritch and arcane sounding as this term may seem, it’s actually quite simple… you need to tell the system what keys are
going to do what. The command to set these parameters is ‘stty’. Watch:

squinkyB ] stty erase ^h
squinkyB ]

There, that wasn’t so bad, was it? Well, it’s also pretty
meaningless to you, unless you have the Ascii table memorized and are
pretty good at on-the-spot deduction. The tty erase parameters determines which key is to be used as a backspace. At times, this may already be set when you log in, or it may be set to a suitable alternate (such as delete).

Most of the time the system will tell you when you log on if this is so. In this case, we’ve entered ^h in order to make the backspace key, appropriately enough, backspace. Another extremely important parameter is ‘intr’. The ‘intr’ parameter tells the Unix system what you intend to use as a break character,  you should have this set to ^c.

Getting Around(A Basic UNIX Overview)

A good thing to remember about Unix is that it’s a lot like DOS. Files are laid out in directories just as in DOS, in fact, the only immediate difference in the directory structures is that Unix uses a
forward-slash (“/”, moron!) instead of a backward one. Also, the basic Unix directory navigation command is identical to DOS. In order to change directories, you use the command ‘chdir’, or ‘cd’.

A quick example:

1 /usr1/astoria ] cd ..
2 /usr ]

Wala. That simple. Quick notes:

ю cd / will take you to root.
ю cd /*pathname* will take you to *pathname*
ю cd home will take you to your home directory.

You can make and delete your own directories with the mkdir/rmdir commands. Simply put, mkdir makes a subdirectory off of the current directory, and rmdir removes a subdirectory from the current subdirectory. Good to know if you plan to do a lot of file transfers.
An important note about Unix directories, files, and concepts: Unix is a case-sensitive operating system. Thus, the files

ю Spleen
ю spleen
ю SpLeEn

Are all different. This rule applies to directories and command line parameters, as well as most other Unix ideas. Another nice thing to know about Unix: Unix files are not subject to
the normal DOS 8-character limit. Thus, you can have vast filenames, such as   “this_file_ate_my_biscuit”.

Some other important commands

First and foremost, you should know cp. cp is the basic Unix equivalent of the DOS COPY command. The command line for cp is identical to that of COPY.
Next on the scale of cosmic import is a cat. cat is the Unix equivalent of the DOS TYPE command, and once again, for simple file displaying, the command line is identical.

Variations on the theme:

pg: displayes a file page by page. Type “pg x filename”, where x is a
number of lines to display before pausing and filename is the
file you wish to display.
more: displays a file screen by screen.

Stupid pet trick:
You can use your cat to copy files, simply by using the directional operators. To copy a file from here to there using cat, simply type:

% cat here
this is the file here
% cat there
this is the file there
% cat here > there
% cat there
this is the file here

The operator “>” simply takes the output from the cat command and places it in the location specified after it.

Another vital command to know is ‘rm’. rm deletes a file from the system, in the same way, DEL would on a DOS system. Not too much else to say. Critical in your navigation of a Unix system is the ls command. ls is DOS DIR on heroin. Simply type ls and you get a nice, neat list of
files in the directory.

DIR on controlled substances:
There are a few command-line parameters that you should know, foremost is l. ls -l gets you a list of files, and valuable information about each file, including permissions (more on that later), size, and linked files. Another useful command for long file lists is C. ls -C gets you a list of files in multiple columns, much the same as DIR /W would merit a double column report of all existing files. A quick reminder:

ls -C is NOT the same as ls -c. Unix = case sensitive.
Another good command to know, mv will move a file from directory to directory. For those of you without DOS 6.0 <gasp>, mv simply copies a file to another directory and deletes the original.

Quick tip for files on the lam:

if you want to rename a file (to protect the innocent), you need to
mv a file to a different file name.

A quick demo:

# ls
# cat myfile
this is my file
# mv myfile my_other_file
# ls
# cat my_other_file
this is my file

Another vastly important command is ‘man’. In fact, man is probably one of the most important commands extant for a beginning user… it calls up the system’s help files. To use man, simply type in ‘man command’, where the command is a Unix command you seek to gain enlightenment regarding. It’s a great way to gain an understanding of Unix command-line parameters.

If you are interested in seeing who’s been on of late, or just want a few names to try to hack, type ‘who’. You get a quick list of users that have accessed the system lately. If you <god forbid> need to know who you are at this point, type ‘whoami’. If you want to change your identity on the system, type ‘su name’ where the name is an account on the system. It’ll ask you for the account
password, then, *presto*… instant transmogrification.

A Caveat for smart alec hackers:
Unix typically logs usage of the su command. While su may seem like a great opportunity to try to hack out passwords manually without worrying about the system hanging up after 3 attempts, it’s typically not a good idea to do this, as it may alert the administrators to
your presence.

*Numero Uno on the list of commands NEVER to use on a Unix system:
The ‘passwd’ command changes your password on a Unix system. Seems innocous enough, eh? Uh-uh. If your account is active, and there’s a very strong chance that it either is or will be, there is no better way to lose the account than to change the password, only to have the legitimate user alert the sysadmins when he/she can’t gain access to his/her normal account (well, there are better ways… you could simply mail the sysadmin and tell him you are trying to hack his grandmother’s life support machine through your account). I’ve seen this single, quick command turn an extremely lax system] into an ironclad security compound in less than a day. DONT-FUCK-WITH-IT.

*Numero Dos on that same list:
The ‘mail’ command reads and sends mail. So what? Well, unless your account is stable (and it isn’t unless you either paid for it or killed the original owner in such a way that his body cannot claw it’s
way out of its grave to its keyboard), the user is more likely than not going to know if you read his mail. In addition, if you send mail out of the system (type ‘mail’, and a username/address; type in your message and end it with a ^d on its own line), the response from your message will likewise alert the user to your presence.

System Spelunking

The first place you want to check out in the wild uncharted directory
tree of your friendly neighborhood Unix system is the “/etc”
directory. What’s in it? The single most intensely important file on
the system (besides a world-writable root-owned SUID file… but don’t
worry about that)… the passwd file.
What is in the passwd file?

ю a list of all accounts on the system
ю a list of the passwords for these accounts
ю a list of access levels for these accounts
ю a list of the home directories for these accounts
ю a list of information pertaining to these accounts.

Why the hell the Unix designers decided this file should be world readable is beyond me. Be content to know that your standard everyday
run-of-the-mill-lacking-in-certified-cosmic-power ‘cat’ command WILL
display this file. As will pg and more. However, because most users
don’t have write permissions (more on that later) to the /etc
directory, ‘cat’ is pretty much the only applicable command here.

However, if you need to copy the file to your own directory (for
whatever reason), just cat it there with the directional operator (>).

The catch:
Well, there are two catches here. First off, regardless of system
security, if the passwords are in the file, they are encrypted. You
can’t decrypt them. Although you can get a list of accounts without
passwords this way (just look for accounts with no entry in the
password field), and a list of accounts that can’t be logged onto
remotely/at all (NO LOGIN), you can’t get much else. Sucks, doesn’t it?

Notice I said ‘if’ the passwords are there.
<ominous soundtrack please>
Some horrible, paranoid, draconian system administrators mutilate
their passwd files in such a way that (*gasp*) the passwords don’t
show up. All you get is one cold, icy X staring at you from the bowels
of Unix Shell Siberia, mocking you as you pull your hair out in
frustration (sorry, but this is a sore spot with me). The kidnapped
passwords reside in the shadow file in the /etc directory, available
with your standard everyday run-of-the-mill-but-distinct-in-the-fact-
that-only-root-level-accounts-can-use-it-to-this-extent ‘cat’ command.
Well, if the passwords are encrypted, what good are they?
By themselves, nothing.

An account with a Unix encrypted password will
get you no further than an account with no listed password at all. You
can’t even deduce the number of characters in the password if it’s
encrypted. So what’s the use?
The Unix method of encrypting files is available to the public. It is
also, to most mortals, irreversible. Essentially, this means you can
encrypt a string of characters, but not decrypt it. Even the UNIX
system itself doesn’t decrypt the password when you log on…

When you log on, the Unix system takes whatever you enter at the
password prompt, encrypts it, and matches it to the entry in the
passwd file. Thus, the Unix system never decrypts the password… it
only compares it to a different encrypted string.
While this may not sound too particularly useful at first, it is.
There are programs that have been written to do the same thing on a
personal computer… you supply it a list of passwords and a list of
words to attempt to use as passwords (called dictionaries), and it
spends the night encrypting dictionaries and matching them to password

By running a dictionary through a passwd file, on a typical
system, you can usually get 10-20 accounts. Good personal computer
examples of this program idea include Killer Cracker (the industry
standard, so to speak) and CrackerJack (faster than Killer Cracker).
Quick tips for CrackerJunkies with leech access at a H/P BBS:
A standard dictionary will not uncover passwords protected with an
appended digit or non-alphanumeric character.

In order to get around
this, you need only grab a program that processes the dictionary file
to add that digit to each entry in the dictionary… although this
takes longer, and you’ll need to do it multiple times, you can
typically get 10 more accounts just by adding a 1 to every entry.
Files and directories in Unix are characterized further by their
permissions. Permissions are a standard system of who gets access to a
specific function of that file or directory. Standard permissions
include read, write, and execute. You can get a list of permissions by
typing ‘ls -l’. The first field in the listing contains the
permissions, grouped as follows:

owner group world
rwx rwx rwx

(Not drawn to scale… in fact, it doesn’t look anything like that).
Essentially, as long as the letter is there, you have access to that
facet of the file. If the letter is not there, you’ll see a dash…
meaning you don’t have access to that function. An example:


In this case, the owner of the file can read the file, Write to the
file, and executing the file; members of his group (a bunch of linked
accounts) can Read the file, CAN NOT Write to the file, and can eXecute
the file; and the rest of the user population CAN NOT Read or Write to
the file, but CAN execute the file.


simply means that anyone can read, write, or execute the file.

Another permission sometimes set to a file is the SUID bit. A SUID
file contains a small case s in the user executable section of the
permissions list…


When you execute a SUID file, your user ID becomes that of the owner
of the file. While this may not look too important at first, by now you
should know that no really important super-elite hacker concept does.
Take a look at this:


Synopsis? It’s a world executable SUID file. In essence, anyone can
execute the file, and in doing so, become the owner of the file for
the duration of the time that file is operating. However, this doesn’t
get you much, because you typically can’t do anything while the
program is running. More likely than not, it’s calculating how many
pencils it needs to order for school tomorrow or some other such
The real power of the SUID file comes into play in this situation:


You won’t see a lot of these, but when you do, look out. What you have
here is a world-writable SUID file… and a world-writable program can
be any program on the system you have read access to. Like, say,
/bin/sh… the Unix shell…
Quick command line example… ‘diablo’ is a root-owned, world-writable
SUID file. I’m going to ignore the rest of the output of the ls

#ls -l
rwsrwxrwx… …diablo
#cat /bin/sh > diablo

Oh, just so you know, the $ prompt denotes root access.
Good deal, huh? In general, if you have the right privs to a SUID file,
copy it to your own directory and cat /bin/sh into it. You now have an
instant gateway to the account of the owner of that file.
If you want to find files that you can do this with, try this out:

#find / -user root -perm -4000 -exec /bin/ls -al {} “;”

This will give you a list of all root-owned SUID files. If you want
more info on the ‘find’ command, just ‘man find’.

Well, I’m overdoing an appointment on the IRC in #warez… so I’ll
cut off here. I hope I’ve been of assistance to you.

A C T U A L A R T I C L E E N D S H E R E . . .

Please feel free to save an extra 1k of file space and invoke the DOS
EDIT CUT command at the dotted line. Do not remove the rest of this
article on penalty of law.


Greets go out to Nowhere Man, INC, THG, UNT, SaD, SoD, PTA, SOB
Thanks to… ________________________
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A Basic UNIX Overview

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