HackTheBox Academy — Linux Fundamentals
System Information
Questions
Find out the machine hardware name and submit it as the answer.
Answer: x86_64
What is the path to htb-student’s home directory?
Answer: /home/htb-student
What is the path to the htb-student’s mail?
Answer: /var/mail/htb-student
Which shell is specified for the htb-student user?
Answer: /bin/bash
Which kernel version is installed on the system? (Format: 1.22.3)
Answer: 4.15.0
What is the name of the network interface that MTU is set to 1500?
Answer: ens192
Navigation
Questions
What is the name of the hidden “history” file in the htb-user’s home directory?
Answer: .bash_history
What is the index number of the “sudoers” file in the “/etc” directory?
Answer: 147627
Working with Files and Directories
Questions
What is the name of the last modified file in the “/var/backups” directory?
Answer: apt.extended_states.0
What is the inode number of the “shadow.bak” file in the “/var/backups” directory?
Answer: 265293
Find Files and Directories
Questions
What is the name of the config file that has been created after 2020–03–03 and is smaller than 28k but larger than 25k?
Answer: 00-mesa-defaults.conf
How many files exist on the system that have the “.bak” extension?
Answer: 4
Submit the full path of the “xxd” binary.
Answer: /usr/bin/xxd
File Descriptors and Redirections
Questions
How many files exist on the system that have the “.log” file extension?
Answer: 32
How many total packages are installed on the target system?
Answer: 737
Filter Contents
Questions
How many services are listening on the target system on all interfaces? (Not on localhost and IPv4 only)
Answer: 7
Determine what user the ProFTPd server is running under. Submit the username as the answer.
Answer: proftpd
Use cURL from your Pwnbox (not the target machine) to obtain the source code of the “https://www.inlanefreight.com" website and filter all unique paths of that domain. Submit the number of these paths as the answer.
Answer: 34
User Management
Questions
Which option needs to be set to create a home directory for a new user using “useradd” command?
Answer: -m
Which option needs to be set to lock a user account using the “usermod” command? (long version of the option)
Answer: --lock
Which option needs to be set to execute a command as a different user using the “su” command? (long version of the option)
Answer: --command
Service and Process Management
Questions
Use the “systemctl” command to list all units of services and submit the unit name with the description “Load AppArmor profiles managed internally by snapd” as the answer.
Answer: snapd.apparmor.service
Task Scheduling
Questions
What is the type of the service of the “syslog.service”?
Answer: notify
Working with Web Services
Questions
Find a way to start a simple HTTP server inside Pwnbox or your local VM using “npm”. Submit the command that starts the web server on port 8080 (use the short argument to specify the port number).
Answer: http-server -p 8080
Find a way to start a simple HTTP server inside Pwnbox or your local VM using “php”. Submit the command that starts the web server on the localhost (127.0.0.1) on port 8080.
Answer: php -S 127.0.0.1:8080
File System Management
Questions
How many disks exist in our Pwnbox? (Format: 0)
Answer: 3