ITN 171 EXAM 4 Chapter 7 and 8 || 100% VERIFIED
ANSWERS!!
T/F A process with no controlling terminal is more commonly known as a daemon. correct
answers TRUE
Match the process phase with its description.
Fork correct answers Creates a process by creating a copy of an existing process
Match the process phase with its description.
Exec correct answers A child process overwrites its own image with the code and data of a
new program
Match the process phase with its description.
Wait correct answers The parent process waits for the child to die, then picks up the exit
status of the child process
T/F The UNIX system communicates the existence of an event to a process through the use
of traps. correct answers FALSE
What is the main difference between the at and batch commands? correct answers -The
commands of a batch job run sequentially one after another while the commands in at jobs
may run in parallel.
T/F UNIX job control enables you to move jobs between foreground and background,
suspend, continue, or kill them. correct answers TRUE
What does it mean when a process traps or "catches" a signal correct answers -the process
invokes a user-defined signal handling function.
Why is the kill -9 signal often a better approach to killing a process than the default kill -15
signal. correct answers -Because the process can't ignore or trap a kill -9 signal.
T/F Signals are the way in which the UNIX operating system can communicate the
occurrence of an event to a process. correct answers TRUE
T/F The PID is a unique number assigned to a process by the kernel. correct answers -TRUE
T/F The init process is the parent process of all other processes and so has a PID of 0. correct
answers -FALSE PID is always 1
A process inherits most of the environment of it's parent EXCEPT the following. correct
answers -User-defined local variables. (CORRECT)
-The current directory from where the process was run (INCORRECT)
T/F To create a crontab entry, simply use your vi editor to create a file foo with an entry of
your choice; then, use the following crontab command, crontab foo, to place the entry in the
directory /var/spool/cron/crontabs. correct answers TRUE
, Is the nohup command required for all shells (Bash, C Shell, Bourne, and Korn Shells)?
correct answers -NO,This feature is not required in Bash or C shells because they continue to
run after user has logged out
T/F The PPID is the PID of the parent process. correct answers TRUE
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - o correct answers Running on the CPU
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - s correct answers Sleeping. Process is waiting
for an event to take place
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - R correct answers Runnable. The process
simply needs to be selected for running
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - T correct answers Suspend. User pressed [Ctrl-
z]
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description- z correct answers Zombie. Parent didn't wait
for the child's death
Match the job control command with its significance- fg correct answers Brings a job to
foreground
Match the job control command with its significance- bg correct answers Moves a job to
background
Match the job control command with its significance- suspend correct answers Suspends a
job
Match the job control command with its significance-
[Ctrl-z] correct answers Suspends the current foreground job
Match the job control command with its significance- jobs correct answers Lists active jobs
Match the job control command with its significance- kill correct answers Kills a job
T/F The signal name for a kill -9 is SIGKILL. correct answers TRUE
T/F For background jobs, STDOUT (standard output) and STDERR (standard error)
normally come to the terminal unless explicitly redirected. correct answers -TRUE
T/F cron is a classic example of a daemon. correct answers TRUE
T/F cron is a one-time scheduler. correct answers FALSE
ANSWERS!!
T/F A process with no controlling terminal is more commonly known as a daemon. correct
answers TRUE
Match the process phase with its description.
Fork correct answers Creates a process by creating a copy of an existing process
Match the process phase with its description.
Exec correct answers A child process overwrites its own image with the code and data of a
new program
Match the process phase with its description.
Wait correct answers The parent process waits for the child to die, then picks up the exit
status of the child process
T/F The UNIX system communicates the existence of an event to a process through the use
of traps. correct answers FALSE
What is the main difference between the at and batch commands? correct answers -The
commands of a batch job run sequentially one after another while the commands in at jobs
may run in parallel.
T/F UNIX job control enables you to move jobs between foreground and background,
suspend, continue, or kill them. correct answers TRUE
What does it mean when a process traps or "catches" a signal correct answers -the process
invokes a user-defined signal handling function.
Why is the kill -9 signal often a better approach to killing a process than the default kill -15
signal. correct answers -Because the process can't ignore or trap a kill -9 signal.
T/F Signals are the way in which the UNIX operating system can communicate the
occurrence of an event to a process. correct answers TRUE
T/F The PID is a unique number assigned to a process by the kernel. correct answers -TRUE
T/F The init process is the parent process of all other processes and so has a PID of 0. correct
answers -FALSE PID is always 1
A process inherits most of the environment of it's parent EXCEPT the following. correct
answers -User-defined local variables. (CORRECT)
-The current directory from where the process was run (INCORRECT)
T/F To create a crontab entry, simply use your vi editor to create a file foo with an entry of
your choice; then, use the following crontab command, crontab foo, to place the entry in the
directory /var/spool/cron/crontabs. correct answers TRUE
, Is the nohup command required for all shells (Bash, C Shell, Bourne, and Korn Shells)?
correct answers -NO,This feature is not required in Bash or C shells because they continue to
run after user has logged out
T/F The PPID is the PID of the parent process. correct answers TRUE
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - o correct answers Running on the CPU
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - s correct answers Sleeping. Process is waiting
for an event to take place
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - R correct answers Runnable. The process
simply needs to be selected for running
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description - T correct answers Suspend. User pressed [Ctrl-
z]
The S (State) column contains one of five possible states for a process. Match the following
state codes with the process state description- z correct answers Zombie. Parent didn't wait
for the child's death
Match the job control command with its significance- fg correct answers Brings a job to
foreground
Match the job control command with its significance- bg correct answers Moves a job to
background
Match the job control command with its significance- suspend correct answers Suspends a
job
Match the job control command with its significance-
[Ctrl-z] correct answers Suspends the current foreground job
Match the job control command with its significance- jobs correct answers Lists active jobs
Match the job control command with its significance- kill correct answers Kills a job
T/F The signal name for a kill -9 is SIGKILL. correct answers TRUE
T/F For background jobs, STDOUT (standard output) and STDERR (standard error)
normally come to the terminal unless explicitly redirected. correct answers -TRUE
T/F cron is a classic example of a daemon. correct answers TRUE
T/F cron is a one-time scheduler. correct answers FALSE
