1-22

/etc/udev

Configuration of udev devices is done by working with files in which directory

Runlevel 1

During the initialization process for a Linux system using SysV init, which runlevel corresponds to single-user mode?

/var/log/dmesg

If the kernel ring buffer had been overwritten, within which file can you look to find boot messages?

/etc/init.d (sometimes linked from /etc/rc.d/init.d as well)

On a system using SysV init, in which directory are the startup and shutdown scripts for services stored?

/proc/interrupts

What command enables you to view the current interrupt request (IRQ) assignments

udevadm

What command is used to view kernel-related udev events in real time

Check to ensure that the disk is deteceted in the basic input/output system (BIOS)

What is a good first troubleshooting step when a hard disk is not detected by the Linux kernel?

telinit

When using SYSV init-based systems, which command would you use if you make changes to the /etc/inittab file and want those changes to be reloaded without a reboot?

info

When working with hotplug devices, you need to gather more information about them through udevadm. Which udevadm command enables you to query the udev database for information on a device?

systemctl status

Which command and option can be used to determine whether given service is currently loaded?

lsmod

Which command can be used to obtain a list of currently loaded kernel modules

init (runlevel 6)

Which command can be used to reboot a system

dmesg

Which command can be used to view the kernel ring buffer in order to troubleshoot the boot process

wall

Which command can you use to send a message to all users who are currently logged into a system?

runlevel

Which command displays the current runlevel for a system?

modprobe

Which command is used to automatically load a module and its dependencies?

lsusb

Which command is used to obtain a list of USB devices?

systemctl list-units

Which command is used with systemd in order to list the available service units?

-nn

Which option to lspci is used to display both numeric codes and device names?

--show-depends

Which option to the modprobe command shows the dependencies for a given module

/sys/bus/usb/devices

Within which directory is information about USB devices stored?

/lib/systemd/system

Within which folder are systemd unit configuration files stored?