linux ch. 9

rogue process

a runaway process that is faulty and consuming mass amounts of system resources

forking definition

the act of creating a new bash shell child process from a parent bash shell process

trapping

the process of ignoring a kill signal

process id

unique identifier assigned to every process as it begins

background command

use to run a foreground process in the background

Ctrl+z and the bg command

used to bypass the wait function and send a user process to the background

at command

used to schedule processes to run at a single instance in the future

cron table

a file specifying tasks to be run by the cron daemon, there are user cron tables and system cron tables

parent process

a process that has started other processes

child process

a process that was started by another process

daemon process def

a system process that is not associated with a terminal

sigkill

absolute kill signal

sigquit

also know as a core dump, terminates a process by taking the process information in memory and saving it to a file called core on the hard disk

sighup

also known as the hang up signal, it stops a process

ps

command entered without arguments used to display a list of processes running in the current shell

top

command 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

at command

command used to schedule commands and tasks to run at a preset time in the future

jobs

command used to see processes running in the background

crontab

command used to view and modify user jobs scheduled to run with cron

renice -12

command which will most likely increase the chance of a process receiving more time slices

true

daemon processes are not associated with terminal, you must use the -e switch with the ps command to view them

parent process ID

every process has a process ID and a ___________

? in the TTY column

how daemons are recognized when you run the ps command

True

if /etc/cron.allow exists, only users listed in it can use the cron command

True

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

True

if/etc/at.allow exists, only users listed in it can use the at command

sigterm

most common kill signal used by programs to kill other processes, default kill signal used by the kill command

daemon process

name given to a process not associated with a terminal

-20 and 19

nice values are used to affect process priorities using a range between __________

/var/spool/cron/(the user's login name)

place where individual user tasks scheduled to run with the cron daemon are stored on a Fedora system

init

process which will always have a PID of 1 and PPID of 0

sigint

sends an interrupt signal to a process, weakest kill signal

forking

term used to describe a process spawning or initiating another process

killall command

terminates all instances of a process with the same name

time slice

amount of time a process is given on a CPU in a multiprocessng operating system

9

kill level signal which cannot be trapped