linux/index.html

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<title>Linux Security & Administration Quiz (Ubuntu)</title>
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<h1>Linux Security & Administration Quiz</h1>

<div id="quiz-container"></div>

<script>
const questions = [
{q:"Which command lists all groups a user belongs to?", a:["cat /etc/group","groups username","ls -l /home","id root"], correct:"b"},
{q:"Which file defines system-wide password complexity rules on Ubuntu?", a:["/etc/security/pwquality.conf","/etc/passwd","/etc/group","/etc/shadow"], correct:"a"},
{q:"What is the purpose of the sticky bit on a directory like /tmp?", a:["Allow anyone to modify all files","Execute files with owner privileges","Only file owner can delete files in the directory","Force password expiration"], correct:"c"},
{q:"Which command safely edits the sudoers file?", a:["nano /etc/sudoers","vi /etc/sudoers","sudoedit /etc/sudoers","visudo"], correct:"d"},
{q:"How do you copy your SSH public key to a remote server?", a:["cp ~/.ssh/id_rsa.pub /remote/server","ssh-copy-id username@remote_host","scp ~/.ssh/id_rsa username@remote_host:/tmp","ssh-add ~/.ssh/id_rsa.pub"], correct:"b"},
{q:"Which chmod value sets read/write/execute for owner, read/execute for group, and no access for others?", a:["777","644","750","600"], correct:"c"},
{q:"Where are per-user password aging rules stored or managed?", a:["chage command and /etc/shadow","/etc/group","/etc/passwd only","~/.bashrc"], correct:"a"},
{q:"What is the purpose of setgid on a directory?", a:["Execute files as the directory owner","Prevent users from deleting files","Encrypt files in the directory","New files inherit the directory’s group ownership"], correct:"d"},
{q:"How do you add a user to the sudo group?", a:["sudo adduser username","sudo usermod -aG sudo username","sudo passwd username","sudo deluser username sudo"], correct:"b"},
{q:"Which command shows both user ID, primary group ID, and secondary groups?", a:["id username","groups username","whoami","cat /etc/passwd"], correct:"a"},
{q:"Which command checks and repairs a Linux filesystem?", a:["fdisk","fsck","parted","mkfs"], correct:"b"},
{q:"Which command creates or modifies disk partitions?", a:["fsck","mkfs","fdisk","df"], correct:"c"},
{q:"Where are system logs typically located?", a:["/var/log","/usr/log","/opt/log","/etc/log"], correct:"a"},
{q:"Which tool configures automatic log rotation?", a:["journalctl","sysctl","logrotate","rsyslog"], correct:"c"},
{q:"Which command lists currently scheduled cron jobs for a user?", a:["sudo crond","crontab -l","systemctl list-timers","ls /etc/cron.d"], correct:"b"},
{q:"What is the correct crontab time format order?", a:["day hour minute month weekday","month day hour minute weekday","hour minute day month weekday","minute hour day month weekday"], correct:"d"},
{q:"Where are system-wide cron jobs typically stored?", a:["/etc/crontab","/var/spool/cron","/usr/local/cron","~/.crontab"], correct:"a"},
{q:"Which command displays current authentication logs?", a:["cat /var/log/syslog","tail -f /var/log/auth.log","grep ssh /etc/passwd","sudo journalctl --kernel"], correct:"b"},
{q:"Which command generates a new SSH key pair?", a:["ssh-add -K","ssh-agent","ssh-keygen","ssh-copy-id"], correct:"c"},
{q:"Default SSH key files are stored in which directory?", a:["~/.ssh/","/etc/ssh/","/usr/ssh/","/var/ssh/"], correct:"a"},
{q:"Which command changes both file owner and group?", a:["chgrp","chmod","usermod","chown user:group file"], correct:"d"},
{q:"Which permission value represents rwxr-xr-x?", a:["740","775","755","644"], correct:"c"},
{q:"Which command sets a password expiration policy?", a:["passwd -l","chage -M 90 username","useradd -p","passwd -S"], correct:"b"},
{q:"Which file controls default password aging for new accounts?", a:["/etc/shadow","/etc/security/limits.conf","/etc/login.defs","/etc/default/useradd"], correct:"d"},
{q:"Which directory contains user-specific crontab files?", a:["/var/spool/cron/crontabs","/etc/cron.daily","/etc/cron.d","/usr/local/cron"], correct:"a"},
{q:"Which command verifies sudo configuration syntax?", a:["sudo -v","visudo -c","sudoedit","test-sudo"], correct:"b"},
{q:"Which option in /etc/sudoers requires users to enter their password?", a:["NOPASSWD","SETENV","!requiretty","PASSWD"], correct:"d"},
{q:"Which tool views kernel and boot logs?", a:["top","sysctl","journalctl -k","dmesg -f"], correct:"c"},
{q:"What does chmod 640 file.txt do?", a:["rw for owner, r for group, none for others","rw for owner, r for all","r for owner, none for others","rwx for owner, r for group, x for others"], correct:"a"},
{q:"Which command changes directory group ownership recursively?", a:["chmod -R","chown -R :groupname /path","usermod -G","chgrp -r"], correct:"b"}
];

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renderQuiz();
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