Unix Bass Unit 3-3 Review
Nice values are used to affect process priorities using a range between ________________________.
-20 and 19
What kill level signal cannot be trapped?
9
What is the name of a process not associated with a terminal?
A daemon process
When you run the ps command, how are daemons process recognized?
A question mark in the TTY column is shown.
How can you bypass the wait function and send a user process to the background?
Cntrl+z then bg.
To kill a process running in the background, you must place a % character before its process ID?.
False
What is a PID?
Process ID, a unique ID that allows the kernel to identify each process
Which of the following commands will most likely increase the chance of a process receiving more time slices?
Renice -12
Which of the following statements is true? (Choose all that apply)
The first three choice are correct.
What is the symbol that creates a pipe between commands?
The pipe ( | ) character but it is not one of your choices.
What system calls are made when you run a program from the command line?
The system makes the fork() system call to create a new child shell and exec() converts it into the executable program.
A Linux process is a program that is running in memory and the CPU.
True
As daemon processes are not associated with terminals, you must use an options such as -e with the ps command to view them.
True
A runaway process that is faulty and consuming mass amount of system resources _________________.
a rogue process
The pkill command terminates ____________.
all instances of a process with the same name matched by a regular expression
A process spawning or initiating another process is referred to as________.
forking
What is the name of the root process under Linux?
init
Which process has a PID of 1 and a PPID of 0?
init/systemd.
Which command can be used to see processes running in the background?
jobs
The at command is used to ________.
schedule processes to run at a single instance in the future
Where are individual user tasks scheduled to run with the cron daemon stored on a Fedora system?
/var/spool/cron/username.
What creates a process under Linux?
NOT ALL OF THE ABOVE. Professor's feedback: And program, command utility, or shell script creates a new process.
Which of the following statements is true? (Choose all that apply) -If /etc/at.allow exists, only users listed in it can use the at command. -If /etc/cron.allow exists, only users listed in it can use the cron command. -If /etc/cron.deny exists and /etc/cron.allow does not exist, any user not listed in /etc/cron.deny can use the cron command. -If /etc/cron.allow and /etc/cron.deny exist, only users listed in the former can use the cron command and any listed in the latter are denied access to the cron command. -It a user is listed in both /etc/cron.allow and /etc/cron.deny, then /etc/cron.deny takes precedence and the user cannot access the crontab command.
If /etc/at.allow exists, only users listed in it can use the at command. If /etc/cron.allow exists, only users listed in it can use the cron command. If /etc/cron.deny exists and /etc/cron.allow does not exist, any user not listed in /etc/cron.deny can use the cron command.
What command is used to view and modify user jobs scheduled to run with cron?
crontab.
What command shows a list of the current processes Linux is executing?
ps
Which command entered without arguments is used to display a list of processes running in the current shell?
ps
Which command is used to gain real-time information about processes running on the system with the most processor-intensive processes listed at the beginning of the list?
top