Deck 9: Managing Linux Processes

Question 1

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.

Answer 1

True

Question 2

Each process can start an unlimited number of other processes.

Answer 2

True

Question 3

Which of the following is not one of the three main types of Linux commands?​

A) ​binary programs
B) ​shell scripts
C) ​shell functions
D) ​device calls

Answer 3

D

Question 4

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

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

Question 5

Zombie processes are also known as defunct processes.​

Question 6

What number indicates the lowest kernel priority (PRI) of a process possible?​

A) ​-20
B) ​0
C) ​20
D) ​127

Question 7

Which 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) SIGKILL
C) SIGQUIT
D) SIGTERM

Question 8

How many different kill signals can be sent by the kill command to a given process?

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

Question 9

When killing a background job with the kill command, the background job ID must be prefixed by what character below?

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

Question 10

The killall command uses the PID to kill a process.

Question 11

What option, when added to the crontab command, opens the vi editor with a user's cron table?

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

Question 12

In a cron table entry, what field specifies the absolute pathname to a command that is to be executed?

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

Question 13

Processes are started with what nice value by default?

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

Question 14

When there are multiple background processes executing in the shell, the jobs command indicates the most recent one with which symbol?

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

Question 15

What kill signal stops a process, then restarts it with the same PID?

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

Question 16

What option can be used with the ps command to display an entire list of processes across all terminals and including daemons?

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

Question 17

What character, when appended to a command, causes the command to be run in the background?

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

Question 18

After a background process has been started, what command below can be used to move it to the foreground?

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

Question 19

In order to display a list of at job IDs, what option can be specified to the at command?

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

Question 20

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

Question 21

When viewing the output of the ps ax​ command, what does a < symbol in the STAT column indicate for a process?

A) ​The process is high priority.
B) ​The process is exiting.
C) ​The process is accepting redirected input from a terminal.
D) ​The process is currently active on the processor.

Question 22

What can be used on a Linux system to trace the lineage of each child process?​

A) ​process ID
B) ​parent process ID
C) ​execution order ID
D) ​process fork ID

Question 23

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?

Question 24

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

Question 25

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
​The command used to schedule commands and tasks to run at a preset time in the future.

Question 26

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
​The act of creating a new BASH shell child process from a parent BASH shell process.

Question 27

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

Question 28

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

Question 29

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

Question 30

​In the process state column, what does an "R" indicate?

A) ​The indicated process is being restarted because it received a SIGHUP kill signal.
B) ​The process is currently running on the processor.
C) ​The process is reading from the local hard disk.
D) ​The process is recovering from a fatal error, and may potentially become a zombie.

Question 31

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
​A unique identifier assigned to every process as it begins.

Question 32

What command below is used to display the lineage of a process by tracing its PPIDs until the init daemon?​

A) ​psbranch
B) ​pstree
C) ​psparent
D) ​pshead

Question 33

Describe how forking works, and how it affects the parent process.

Question 34

Explain why scheduling commands can be beneficial, and detail some of the methods available for scheduling commands.

Question 35

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
​A process that was started by another process.

Question 36

On a Fedora based system, where are the shell environment and scheduled commands for at stored?​

A) ​/var/spool/cron/atjobs
B) ​/var/spool/at
C) ​/var/run/at
D) /var/run/cron/at​

Question 37

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
The process of ignoring a kill signal.​

Question 38

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

Question 39

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 40

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

Question 41

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
​A system process that is not associated with a terminal.

Question 42

​What two ps options can be used to display a full list of information about each process, and a long list of information about each process?

A) ​-e
B) ​-p
C) ​-f
D) ​-l

Question 43

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
​The amount of time a process is given on a CPU in a multiprocessing operating system.

Question 44

What kill signal and number can be used to send an interrupt signal to a process, and is the same as using the Ctrl+c combination to kill a running process?​

A) SIGHUP​
B) ​SIGINT
C) ​1
D) ​2

Question 45

What two processes below will show up as PID 1, depending on whether a system uses UNIX SysV or Systemd init processes?

A) ​kthreadd
B) ​syslogd
C) ​init
D) ​systemd

Question 46

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
A file specifying tasks to be run by the cron daemon​

Question 47

What two commands below can be used to stop a process, either by PID number or process name?​

A) ​end
B) ​stop
C) kill​
D) ​killall

Question 48

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
The command used to run a foreground process in the background.​

Question 49

​Match each correct item with the statement below.​​​
a.​at command
b.background command​
c.​child process
d.cron table​
e.​daemon process
f.​forking
g.​parent process
h.​process ID (PID)
i.​time slice
j.trapping
​A process that has started other processes.

Question 50

What signal name and number function as the absolute kill signal, and when issued, forces the Linux kernel to stop executing the process by sending the process's resources to /dev/null?​

A) ​SIGINT
B) ​SIGKILL
C) ​2
D) ​9