Deck 9: Managing Linux Processes

Question 1

The ____ kill signal stops a process and then restarts it with the same PID.

A) SIGINT
B) SIGQUIT
C) SIGHUP
D) SIGTERM

Answer 1

C

Question 2

Most commands such as ls, find, and grep are binary programs that exist on the filesystem until executed. _________________________

Answer 2

True

Question 3

You can execute ____ main types of Linux commands.

A) two
B) three
C) four
D) five

Answer 3

B

Question 4

Each process can start an unlimited number of other processes.

Question 5

The init daemon has a PID of 0. _________________________

Question 6

To display an entire list of processes across all terminals and including daemons, you can add the ____ option to any ps command.

A) -f
B) -l
C) -a
D) -e

Question 7

The ps command is the only command that can view process information.

Question 8

When killing a background job with the kill command, you must prefix the background job IDs by a(n) ____.

A) &
B) #
C) $
D) %

Question 9

After a process has been started, you can change its priority by using the renice command.

Question 10

The killall command uses the PID to kill a process.

Question 11

The ____ kill signal terminates a process by taking the process information in memory and saving it to a file called core on the hard disk in the current working directory.

A) SIGINT
B) SIGQUIT
C) SIGKILL
D) SIGTERM

Question 12

A value of 0 for a process priority indicates low priority. _________________________

Question 13

In the output of the ps -l command, the ____ column is the most valuable to systems administrators because it indicates what the process is currently doing.

A) process state
B) process flag
C) process priority
D) PID

Question 14

If the /etc/at.allow and /etc/at.deny files do not exist, only the root user is allowed to schedule tasks using the at daemon.

Question 15

The ____ option to the ps command displays all processes that do not run on terminals.

A) -f
B) x
C) a
D) -l

Question 16

The SIGINT kill signal is the default kill signal used by the kill command. _________________________

Question 17

A system process that is not associated with a terminal is called a(n) ____ process.

A) daemon
B) user
C) parent
D) startup

Question 18

When you append a(n) ____ to a command, the command is run in a background process.

A) &
B) $
C) #
D) %

Question 19

While a process is waiting for its parent process to release the PID, the process is said to be in a(n) zombie state. _________________________

Question 20

There are ____ different kill signals that the kill command can send to a certain process.

A) 16
B) 32
C) 64
D) 128

Question 21

Processes that have encountered an error during execution and continuously uses up system resources are referred to as ____________________ processes.

Question 22

The ____________________ can be used to affect the process priority indirectly.

Question 23

Processes are started with a nice value of ____ by default.

A) -20
B) 0
C) 1
D) 19

Question 24

After a background process has been started, it can be moved to the foreground by using the ____ command.

A) b2f
B) fgd
C) fg
D) fgnd

Question 25

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
Daemon used to schedule a command to execute repeatedly in the future.

Question 26

A(n) ____________________ refers to a program that is running in memory and on the CPU.

Question 27

The ____ field in a cron table contains the absolute pathname to the command to be executed.

A) first
B) second
C) fifth
D) sixth

Question 28

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
The location of system cron tables.

Question 29

In a process referred to as ____________________, when executing compiled programs or shell scripts, the BASH shell that interprets the command you typed creates a new BASH shell.

Question 30

To create or edit a user cron table, you can use the ____ option to the crontab command.

A) -u
B) -c
C) -f
D) -e

Question 31

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
Directory storing the shell environment and scheduled commands.

Question 32

When there are multiple background processes executing in the shell, the jobs command indicates the most recent one with a(n) ____ symbol.

A) *
B) +
C) -
D) /

Question 33

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
Identifies the process that started another process.

Question 34

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
Daemon used to schedule a command to execute once in the future.

Question 35

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
An executable file on the hard disk that can be run when you execute it.

Question 36

To display a list of at Job IDs, you can specify the ____ option to the at command.

A) -l
B) -u
C) -a
D) -d

Question 37

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
A process's identifier that allows the kernel to identify it uniquely.

Question 38

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
Ignoring a kill signal.

Question 39

The amount of time a process has to use the CPU is called a(n) ____________________.

Question 40

Match each term with the correct statement below.
a.cron daemon
f.PID
b.program
g./etc/crontab
c./var/spool/cron
h./var/spool/at
d.trapping
i.at daemon
e.PPID
The location of user cron tables.

Question 41

How does the nice value affect process priority? How and why can nice values be altered?

Question 42

Describe the system cron table. How it is organized, and what information may be contained within it?

Question 43

What is forking?

Question 44

Why would you want to schedule commands? What methods are available for scheduling commands?

Question 45

Describe the purpose the process state column displayed by the ps -l command. What values may appear in this column, and what do these values indicate?