Add hacking session material

hacking_session/exercise_files/fileSystems/image.iso

+You successfully wrote an image to fake disk!

hacking_session/exercise_files/grep_exercise.md

+# For the grep exercise
+
+## Explanation
+
+This is a textfile for use with the grep exercise. 
+It contains some words, so you can search for patterns.
+
+Dog
+Dig
+Dug
+
+Here is a line containing a ## that is not at the beginning of the line because I am evil.
+
+Brat
+
+Cat
+Rat
+Sat
+Mat
+Wat
+Latin
+Pat
+Hat
+Fat
+Vat
+Tat
+Bat
+
+
+## Animals
+
+This subsection contains a list of "animals".
+(The plus signs are there to make things slightly easier for you. After all, it's fairly hard to distinguish animals from other words using only regexes)
+
++ Dangernoodle, a natural enemy of the Booplesnoot
++ Majestic Sea Flap-Flap
++ Dangerous Sea Flap-Flap
++ Trash Panda
++ Fart Squirrel (not as undangerous as it sounds)
++ Danger Floof - not to be confused with the Danger Water Cow
++ Nope Rope
++ Sword Pig (not as dangerous as it sounds)
++ Bacon Puppy
++ Dapper Chickens
++ and finally Strangerdanger which could be a name for a dog.
+
+### This is a subsubsection
+
+* It contains
+* Some list elements
+* Such as this one
+
+### Code
+
+Here's some code that can be searched.  
+This is a bit harder, since the exercises corresponding to it, require regexes that span over multiple lines.
+
+```java
+
+class Main {
+	public static void main(String[] args) {
+		Out o = new Out();
+		o.out();
+	}
+}
+
+class Out {
+	public void out() {
+		System.out.println("Hello World!");
+	}
+}
+```

hacking_session/exercise_files/jobs/infiniteloop.sh

+#!/usr/bin/env bash
+
+while true; do
+    echo "this is an infinite loop... kill me if you can"
+    sleep 1
+done

hacking_session/exercise_files/supercoolNumericalSimulation.c

+/*
+ * This program is a super awesome numerical simulation of some super duper
+ * new ultra cool physcial thingy. And of course it takes forever to run,
+ * so you have to run on the ultra modern amazingly new TheAlt super cluster.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <time.h>
+#include <stdlib.h>
+
+int main() {
+    printf("Starting calculation...\n");
+
+    sleep(2);
+
+    // some cleverly named variables
+    int a, b, c;
+
+    // initialize the variables
+    a = 42;
+    b = 0;
+    c = 0;
+
+    //actually do the calculation
+    b = c++;
+    b++;
+    int temp = a;
+    a = b + c;
+
+    srand(time(NULL));
+    int r;
+    int i = 200000;
+    while (i --> 0) {
+    	r = rand();
+	printf("%d \n", r);
+	sleep (0.8);
+	if (i == 150000) {
+		printf ("\n preprocessing done\n");
+		sleep(1);
+	} else if (i == 1000) {
+		printf("\n Main calculations done. Starting Clean up \n");
+		sleep(1);
+	}
+    }
+
+    c = temp+1;
+    a = temp;
+    int res = a;
+
+    char result[3];
+    result[2] = 0;
+
+    if (res == 42) {
+        // we are happy the calculation worked
+        snprintf(result, 3, "%d", res);
+    } else {
+        result[0] = '4'; // correct the wrong calculation
+        result[1] = '2';
+    }
+
+    // save the result in the res file
+    FILE *fp;
+    fp = fopen("AmazingResults.txt", "w+");
+    fputs(result, fp);
+    fclose(fp);
+
+    // notify the user
+    printf("the answer to everything has just been calculated\n");
+    return 0;
+}