Linux Commands Quiz - Basic 03 to Basic 04

Which command is used to display disk usage by directory in human-readable form?

• df -h

• du -sh *

• ls -lh

• mount -h

What does the `nice` command do in Linux?

• Changes file ownership

• Adjusts user login limits

• Sets priority for a process

• Encrypts a file

What is the default runlevel for multi-user mode without GUI in most Linux distributions using SysVinit?

• 2

• 3

• 5

• 1

Which command is used to change the hostname of a Linux system (runtime)?

• hostnamectl set-host

• hostnamectl set-hostname

• set-hostname

• sysctl hostname

Which of the following tools is used for analyzing system boot performance in systemd-based Linux systems?

• journalctl

• systemctl

• bootstat

• systemd-analyze

What is the use of `/etc/sudoers` file?

• To manage user groups

• To define system resource limits

• To control sudo access permissions

• To store user passwords

What does the command `iptables -L` do?

• Lists all users

• Loads firewall rules

• Lists active firewall rules

• Logs incoming traffic

Which utility is used to view real-time logs from systemd journal?

• logcat

• journald

• journalctl -f

• syslog -r

Which file is used to configure kernel parameters at runtime?

• /etc/kernel.conf

• /boot/config

• /etc/sysctl.conf

• /usr/syslog.conf

How do you grant a user sudo privileges in Ubuntu?

• Add to /etc/shadow

• Add to /etc/passwd

• Add to the sudo group

• Give them root password