Linux 103 - Chapter 3

Question 1

What statement is correct when talking about /proc?

Answer 1

All changes to files in /proc/ are immediately recognized by the kernel.

Question 2

What 3 pieces of information can the lspci command display about the system hardware?

Answer 2

Device IRQ settings, PCI bus speed, & device vendor identification

Question 3

What command updates the linker cache of the shared libraries?

Answer 3

ldconfig

Question 4

What file should be edited to select the network locations from which Debian installation package files are loaded?

Answer 4

/etc/apt/sources.list

Question 5

What command will generate a list of user names from /etc/passwd along with their login shell?

Answer 5

cut -d: -f1, 7 /etc/passwd

Question 6

What is the maximum niceness value that a regular user can assign to a process with the nice command when executing a new process?

Answer 6

19

Question 7

What command kills the process with the PID 123 but allows the process to “clean up” before exiting?

Answer 7

kill -TERM 123

Question 8

What is the device file name for the second partition on a SCSI drive?

Answer 8

/dev/sda2

Question 9

In order to display all currently mounted filesystems, which of the following commands could be used? (Two answers)

Answer 9

cat /proc/xxxx/mounts

mount

Question 10

Which command changes the number of days before the ext3 filesystem on /dev/sda1 has to run through a full filesystem check while booting?

Answer 10

tune2fs -i 200 /dev/sda1

Question 11

What type of filesystem is created by mkfs when it is executed with the block device name only and without any additional parameters?

Answer 11

ext2

Question 12

How many fields are in a syntactically correct line of /etc/fstab?

Answer 12

6

Question 13

What two commands create an ext3 filesystem on /dev/sdb1?

Answer 13

/sbin/mke2fs -j /dev/sdb1

/sbin/mkfs -t ext3 /dev/sdb1

Question 14

After running the command: umount /mnt, the following error message is displayed:
umount: /mnt: device is busy
What is a common reason for this message?

Answer 14

A user has a file open in the /mnt directory.

Question 15

Which command will disable swapping on a device? (Specify ONLY the commend without any path or parameters.)

Answer 15

swapoff

Question 16

What does this command do: mount -a

Answer 16

It mounts all filesystems listed in /etc/fstab which have the option auto set

Question 17

Which signal is missing from the following command that is commonly used to instruct a daemon to reinitialize itself, including reading configuration files?

killall -s ________ daemon

Answer 17

SIGHUP or HUP or 1

Question 18

Which command displays a list of all background tasks running in the current shell?

Answer 18

jobs

Question 19

Which command is used in a Linux environment to create a new directory? (Specify ONLY the command without any path or parameters.)

Answer 19

mkdir OR /usr/bin/mkdir

Question 20

You are preparing a new set of shared libraries in /usr/local/applib and you have written and compiled some code that uses these libraries. You have already performed an ldconfig, however the system still cannot find the shared libraries. What is most likely the cause of this?

Answer 20

You forgot to put the library path in ld.so.conf

Question 21

What statement is correct regarding the command: foo 1> bar?

Answer 21

The stdout from the command foo overwrites the file bar.

Question 22

What command will send output from the program myapp to both standard output and the file file1.log?

Answer 22

myapp | tee file1.log

Question 23

After modifying GNU GRUB’s configuration file, which command must be run for the changes to take effect?

Answer 23

No action is required?

Question 24

Which system administration command can you use to update ld.so.cache after the installation of new shared libraries?

Answer 24

ldconfig

Question 25

To allow a regular user account to mount and unmount a filesystem (for instance, a cdrom or floppy), which of the following options will need to be added to the corresponding line in /etc/fstab?

Answer 25

user