CET 130 chapter 9
On a Fedora based system, where are the shell environment and scheduled commands for at stored?
/var/spool/at
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.
True
Processes are started with what nice value by default?
o
Processes that have encountered an error during execution and continuously uses up system resources are referred to as ____________________ processes.
rogue
What kill signal stops a process, then restarts it with the same PID?
sighup
The amount of time a process has to use the CPU is called a(n) ____________________.
time slice
What option can be used with the ps command to display an entire list of processes across all terminals and including daemons?
x
What character, when appended to a command, causes the command to be run in the background?
&
The killall command uses the PID to kill a process.
False
When killing a background job with the kill command, the background job ID must be prefixed by what character below?
%
When there are multiple background processes executing in the shell, the jobs command indicates the most recent one with which symbol?
+
What option, when added to the crontab command, opens the vi editor with a user's cron table?
-e
In order to display a list of at job IDs, what option can be specified to the at command?
-l
What number indicates the lowest kernel priority (PRI) of a process possible?
127
How many different kill signals can be sent by the kill command to a given process?
64
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?
SIGQUIT
After a process has been started, you can change its priority by using the renice command.
True
Each process can start an unlimited number of other processes.
True
Zombie processes are also known as defunct processes.
True
After a background process has been started, what command below can be used to move it to the foreground?
fg
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.
forking
When viewing the output of the ps ax command, what does a < symbol in the STAT column indicate for a process?
high priority
The ____________________ can be used to affect the process priority indirectly.
nice value
What can be used on a Linux system to trace the lineage of each child process?
ppid
A(n) ____________________ refers to a program that is running in memory and on the CPU.
process
In the process state column, what does an "R" indicate?
process is running
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?
process state
What command is used to display the lineage of a process by tracing its PPIDs until the init daemon?
pstree
In a cron table entry, what field specifies the absolute pathname to a command that is to be executed?
sixth
Name the three main types of Linux commands?
binary programs, shell scripts, shell functions
