Chapter 9
When killing a background job with the kill command, you must prex the background job IDs by?
%
When you append a(n) ____ to a command, the command is run in a background process.
&
When there are multiple background processes executing in the shell, the jobs command indicates the most recent one with a(n) ____ symbol.
+
To display a list of at Job IDs, what option you can specify to the at command.
-l
How many main types of Linux commands you can execute?
3
The ps command is the only command that can view process information.
False
he killall command uses the PID to kill a process.
False
After a process has been started, you can change its priority by using the renice command.
True
In the output of the ps -l command, which column is the most valuable to systems administrators because it indicates what the process is currently doing?
process state
To create or edit a user cron table, you can use the ____ option to the crontab command.
-e
To display an entire list of processes across all terminals and including daemons, which option you can to a ps command?
-e
Processes are started with a nice value of ____ by default
0
A system process that is not associated with a terminal is called?
daemon
After a background process has been started, it can be moved to the foreground by using which command?
fg
A value of 0 for a process priority indicates low priority
False
Can a process have multiple parent processes?
False
Can the SIGKILL kill signal be trapped by a process?
False
Can the top command be used to change the priority of processes?
False
Does a negative nice value give a process a greater chance of a lower priority?
False
If you send a kill signal to a process that has children, are the child processes terminated?
False
The SIGINT kill signal is the default kill signal used by the kill command.
False
The init daemon has a PID of 0.
False
Which kill signal stops a process and then restarts it with the same PID?
SIGHUP
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
Which field in a cron table contains the absolute pathname to the command to be executed?
Sixth
Each process can start an unlimited number of other processes.
True
If the /etc/at.allow and /etc/at.deny les do not exist, only the root user is allowed to schedule tasks using the at daemon.
True
Most commands such as ls, find, and grep are binary programs that exist on the lesystem until executed.
True
While a process is waiting for its parent process to release the PID, the process is said to be in a(n) zombie state.
True
The ____ option to the ps command displays all processes that do not run on terminals.
x
How many different kill signals can kill command send?
64
