Hello Hackers

Linux Luminarium

This module will teach you the VERY basics of interacting with the command line! The command line lets you execute commands. When you launch a terminal, it will execute a command line "shell", which will look like this:

hacker@dojo:~$

This is called the "prompt", and it's prompting you to enter a command. Let's take a look at what's going on here:

The hacker in the prompt is the username of the current user. In the pwn.college DOJO environment, this is "hacker".
In the example above, the dojo part of the prompt is the hostname of the machine the shell is on (this reminder can be useful if you are a system administrator who deals with many machines on a daily basis, for example). In the example above, the hostname is dojo, but in pwn.college, it will be derived from the name of the challenge you're attempting.
We will cover what ~ means later :-)
The $ at the end of the prompt signifies that hacker is not an administrative user. In much later modules in pwn.college, when you learn to use exploits to become the administrative user, you will see the prompt signify that by printing # instead of $, and you'll know that you've won!

Anyways, the prompt awaits your command. Move on to the first challenge to learn how to actually execute commands!

Lectures and Reading

An extensive bash tutorial.

Challenges

In this challenge, you will invoke your first command! When you type a command and hit enter, the command will be invoked, as so:

hacker@dojo:~$ whoami
hacker
hacker@dojo:~$

Here, the user executed the whoami command, which simply prints the username (hacker) to the terminal. When the command terminates, the shell once again displays the prompt, ready for the next command.

In this level, invoke the hello command to get the flag! Keep in mind: commands in Linux are case sensitive: hello is different from HELLO.

Let's try something more complicated: a command with arguments, which is what we call additional data passed to the command. When you type a line of text and hit enter, the shell actually parses your input into a command and its arguments. The first word is the command, and the subsequent words are arguments. Observe:

hacker@dojo:~$ echo Hello
Hello
hacker@dojo:~$

In this case, the command was echo, and the argument was Hello. echo is a simple command that "echoes" all of its arguments back out onto the terminal, like you see in the session above.

Let's look at echo with multiple arguments:

hacker@dojo:~$ echo Hello Hackers!
Hello Hackers!
hacker@dojo:~$

In this case, the command was echo, and Hello and Hackers! were the two arguments to echo. Simple!

In this challenge, to get the flag, you must run the hello command (NOT the echo command) with a single argument of hackers. Try it now!

30-Day Scoreboard:

This scoreboard reflects solves for challenges in this module after the module launched in this dojo.

7-Day | 30-Day | All-Time

Rank		Hacker	Badges		Score

Hello Hackers

Linux Luminarium

Lectures and Reading

Other Tutorials

Challenges

Intro to Commands

Intro to Arguments

30-Day Scoreboard:

Hello Hackers

Linux Luminarium

Lectures and Reading

Other Tutorials

Other Tutorials

Challenges

Intro to Commands 3 hacking, 6903 solves

Intro to Commands

Intro to Arguments 3 hacking, 6711 solves

Intro to Arguments

30-Day Scoreboard: