Linux 101⚓︎
Difficulty:
Direct link: Objective URL
Objective⚓︎
Request
Visit Ginger Breddie in Santa's Shack on Christmas Island to help him with some basic Linux tasks. It's in the southwest corner of Frosty's Beach.
Ginger Breddie
Hey, welcome to Santa's Surf Shack on tropical Christmas Island! I'm just hanging ten here, taking it easy while brushing up on my Linux skills.
You ever tried getting into Linux? It's a super cool way to play around with computers.
Solution⚓︎
The North Pole 🎁 Present Maker: All the presents on this system have been stolen by trolls. Capture trolls by following instructions here and 🎁's will appear in the green bar below. Run the command "hintme" to receive a hint.
Q1. Perform a directory listing of your home directory to find a troll and retrieve a present!
ls
Q2. Now find the troll inside the troll.
cat troll_19315479765589239
troll_24187022596776786
Q3. Great, now remove the troll in your home directory.
rm troll_19315479765589239
Q4. Print the present working directory using a command.
pwd
/home/elf
Q5. Good job but it looks like another troll hid itself in your home directory. Find the hidden troll!
ls -la
.troll_5074624024543078
Q6. Excellent, now find the troll in your command history.
history
Q7. Find the troll in your environment variables.
env
z_TROLL=troll_20249649541603754
Q8. Next, head into the workshop.
cd workshop/
Q9. A troll is hiding in one of the workshop toolboxes. Use "grep" while ignoring case to find which toolbox the troll is in.
grep -i troll* *
toolbox_191.txt:tRoLl.4056180441832623
Q10. A troll is blocking the present_engine from starting. Run the present_engine binary to retrieve this troll.
chmod +x present_engine
./present_engine
troll.898906189498077
Q11. Trolls have blown the fuses in /home/elf/workshop/electrical. cd into electrical and rename blown_fuse0 to fuse0.
mv blown_fuse0 fuse0
troll.898906189498077
Q12. Now, make a symbolic link (symlink) named fuse1 that points to fuse0
ln -s fuse0 fuse1
Q13. Make a copy of fuse1 named fuse2.
cp fuse1 fuse2
Q14. We need to make sure trolls don't come back. Add the characters "TROLL_REPELLENT" into the file fuse2.
echo TROLL_REPELLENT > fuse2
Q15. Find the troll somewhere in /opt/troll_den
find /opt/troll_den/ -iname '*troll*'
/opt/troll_den/apps/showcase/src/main/resources/tRoLl.6253159819943018
Q16 - Find the file somewhere in /opt/troll_den that is owned by the user troll.
find /opt/troll_den/ -user troll
/opt/troll_den/apps/showcase/src/main/resources/template/ajaxErrorContainers/tr0LL_9528909612014411
Q17 Find the file created by trolls that is greater than 108 kilobytes and less than 110 kilobytes located somewhere in /opt/troll_den.
find /opt/troll_den/ -size +108k -size -110k
find /opt/troll_den/ -size +108k -size -110k
Q18 List running processes to find another troll.
ps aux
elf 7134 0.3 0.0 31520 26960 pts/2 S+ 07:35 0:00 /usr/bin/python3 /14516_troll
Q19 The 14516_troll process is listening on a TCP port. Use a command to have the only listening port display to the screen.
netstat -a -t
tcp 0 0 0.0.0.0:54321 0.0.0.0:* LISTEN
Q20 The service listening on port 54321 is an HTTP server. Interact with this server to retrieve the last troll.
curl http://0.0.0.0:54321
troll.73180338045875
Q21 Your final task is to stop the 14516_troll process to collect the remaining presents.
kill -9 7134
Congratulations, you caught all the trolls and retrieved all the presents!
Answer
Congratulations, you caught all the trolls and retrieved all the presents!
Response⚓︎
Ginger Breddie
Wow, if your surfing skills are as good as your Linux skills, you could be winning competitions!