Problem 1

Lecture 1

• Used single quotes to ignore special functions of characters # and ! for Q5

  • echo '#!/bin/sh' >> semester
  • Tried using ^ but didnt work

• The “x” (executing) permission is not given to any user in Q6

• The sh command uses the bourne shell which works slightly differently from the bash shell in Q7

• Used chmod +x semester for Q9 to add executable permission

• Used stat -c '%y' semester | tee last-modified.txt for Q10

Lecture 2

• ls -halt --color for Q1
• Marco.sh contains answer of Q2 and Checker.sh contains the script for Q3
• Command for Q4: find . -name "*.html" -print0 | xargs -0 tar -czf zippy.zip
  • -print0 uses null characters to seperate file names
  • | creates the pipe
  • Xargs passes the outputs of find as arguments
  • czf flag, creates a new archive, zips it and specifies the file name

Bandit

Level 6: find / -user bandit7 -group bandit6 -size 33c 2>/dev/null

Level 7: grep -H "millionth" data.txt

Level 8: cat data.txt | sort | uniq -u

Level 9: couldnt solve, found the password easily in the printed text

Level 10: base64 -d data.txt

Level 11: cat data.txt | tr 'A-Za-z' 'N-ZA-Mn-za-m'

Level 12:

• used xxd to decompress and used file at each stage to check the file output type
• used gzip to decompress
• used bzip2
• used gzip
• used tar -xvf 4 times
• gzip

Level 13: saved key as a file and used chmod 600 to change its permissions then logged in

Level 14: nc localhost 30000

Level 15: openssl s_client -connect localhost:30001

Git immersion

See terminal.html under git_tutorial

Script automation

Python script has been included