Linux Fundamental Part 2 tryhackme (https://tryhackme.com/room/linux2#)

[Task 1] Intro

Deploy the machine!

[Task 2] Methodology

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[Task 3] [Section 1: SSH] — Intro

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[Task 4] [Section 1: SSH] — Putty and ssh

SSH into the server

[Task 5] [Section 2: Running Commands] — Basic Command Execution

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[Task 6] [Section 2: Running Commands] — Manual Pages and Flags

#1 How would you output hello without a newline

echo -n hello

[Task 7] [Section 3: Basic File Operations] — ls

#1 What flag outputs all entries

-a

#2 What flag outputs things in a “long list” format

-l

[Task 8] [Section 3: Basic File Operations] — cat

#1 What flag numbers all output lines?

-n

[Task 9] [Section 3: Basic File Operations] — touch

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[Task 10] [Section 3: Basic File Operations] — Running A Binary

#1 How would you run a binary called hello using the directory shortcut . ?

#2 How would you run a binary called hello in your home directory using the shortcut ~ ?

~/hello

#3 How would you run a binary called hello in the previous directory using the shortcut .. ?

../hello

[Task 11] Binary — Shiba1

#1 What’s the password for shiba2

touch noot.txt
./shiba1

pinguftw

[Task 12] su

#1 How do you specify which shell is used when you login?

-s

[Task 13] [Section 4 — Linux Operators]: Intro

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[Task 14] [Section 4: Linux Operators]: “>”

#1 How would you output twenty to a file called test

echo twenty > test

[Task 15] [Section 4: Linux Operators]: “>>”

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[Task 16] [Section 4: Linux Operators]: “&&”

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[Task 17] [Section 4: Linux Operators]: “&”

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[Task 18] [Section 4: Linux Operators]: “$”

#1 How would you set nootnoot equal to 1111

export nootnoot=1111

#2 What is the value of the home environment variable

echo $HOME

/home/shiba2

[Task 19] [Section 4: Linux Operators]: “|”

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[Task 20] [Section 4: Linux Operators] — “;”

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[Task 21] Binary — shiba2

#1 What is shiba3’s password

export test1234=$USER
./shiba2

happynootnoises

[Task 22] [Section 5 — Advanced File Operations]: Intro

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[Task 23] [Section 5 — Advanced File Operators]: A bit of background.

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[Task 24] [Section 5: Advanced File Operations]: chmod

#1 What permissions mean the user can read the file, the group can read and write to the file, and no one else can read, write or execute the file?

· User: r — = 4 — = 4

· Group: rw- = 42- = 4 + 2 = 6

· Everyone else: — — = 0

460

#2 What permissions mean the user can read, write, and execute the file, the group can read, write, and execute the file, and everyone else can read, write, and execute the file.

· User: rwx = 421 = 7

· Group: rwx = 421 = 7

· Everyone else: rwx = 421 = 7

777

[Task 25] [Section 5: Advanced File Operations] — chown

#1 How would you change the owner of file to paradox

chown paradox file

#2 What about the owner and the group of file to paradox

chown paradox:paradox file

#3 What flag allows you to operate on every file in the directory at once?

-R

[Task 26] [Section 5: Advanced File Operations] — rm

#1 What flag deletes every file in a directory

-r

#2 How do you suppress all warning prompts

-f

[Task 27] [Section 5: Advanced File Operations] — mv

#1 How would you move file to /tmp

mv file /tmp

[Task 28] [Section 5: Advanced File Operations] — cp

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[Task 29] [Section 5: Advanced file Operations] — cd && mkdir

#1 Using relative paths, how would you cd to your home directory.

cd ~

#2 Using absolute paths how would you make a directory called test in /tmp

mkdir /tmp/test

[Task 30] [Section 5: Advanced File Operations] ln

#1 How would I link /home/test/testfile to /tmp/test

ln /home/test/testfile /tmp/test

[Task 31] [Section 5 — Advanced File Operations]: find

#1 How do you find files that have specific permissions?

-perm

#2 How would you find all the files in /home

find /home

#3 How would you find all the files owned by paradox on the whole system

find / -user paradox

[Task 32] [Section 5: Advanced File Operations] — grep

#1 What flag lists line numbers for every string found?

-n

#2 How would I search for the string boop in the file aaaa in the directory /tmp

grep boop /tmp/aaaa

[Task 33] Binary — Shiba3

#1 What is shiba4’s password

find / -name shiba4 -type f 2>>/dev/null

/ to search the entire filesystem,
-name to specify the name of the file,
-type f to specify that I wanted a file, not a directory
2>>/dev/null to discard all errors.

/opt/secret/shiba4

test1234

[Task 34] [Section 6: Miscellaneous]: Intro

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[Task 35] [Section 6: Miscellaneous]: sudo

#1 How do you specify which user you want to run a command as.

-u

#2 How would I run whoami as user jen?

sudo -u jen whoami

#3 How do you list your current sudo privileges(what commands you can run, who you can run them as etc.)

-l

[Task 36] [Section 6: Miscellaneous]: Adding users and groups

#1 How would I add the user test to the group test

sudo usermod -a -G test test

[Task 37] [Section 6: Miscellaneous]: nano

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[Task 38] [Section 6: Miscellaneous]: Basic shell scripting

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[Task 39] [Section 6: Miscellaneous]: Important Files and Directories

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[Task 40] [Section 6 — Miscellaneous]: Installing packages(apt)

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[Task 41] [Section 6: Miscellaneous]: Processes

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[Task 42] Fin ~

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[Task 43] Bonus Challenge — The True Ending

#1 Finish this room off! What is the root.txt flag

su shiba2
cat /var/log/test1234
su nootnoot
sudo -l

sudo cat /root/root.txt