Linux 3060 chapter - 8
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62 terms
Terms | Definitions |
|---|---|
 & | A special character used to start a program in the background. |
| /etc/at.allow | A file that lists users who can use the at command. |
| /etc/at.deny | A file that lists users who cannot use the at command. |
| /etc/cron.d | A directory that contains additional system cron tables. |
| /etc/crontab | The system cron table. |
| /etc/init.d | The directory that contains the scripts used to start most daemons. |
| /etc/init.d/skeleton | A sample script that may be copied to create scripts used to start a daemon. |
| /etc/inittab | The configuration file for the init daemon. |
| /etc/rc.d/rc | The script that executes files in the /etc/rc.d/rc*.d directories. |
| /etc/rc.d/rc*.d | The directories used by the init daemon to start and kill daemons in each runlevel. |
| /var/log/boot.msg | The log file that stores information about daemon startup at system initialization. |
| /var/spool/cron/allow | A file that lists users who can use the crontab command. |
| /var/spool/cron/deny | A file that lists users who cannot use the crontab command. |
| /var/spool/cron/tabs | The directory used to store user crontabs. |
| at command | Used to schedule commands to run at a certain time in the future. |
| atq command | Used to view scheduled at jobs. |
| atrm command | Used to remove a scheduled at job. |
| background process | A process that runs unnoticed in your terminal and does not interfere with your command line interface. |
| bg command | Used to start a process in the background. |
| child process | A process that is started by another process. |
| chkconfig | Used to configure the daemons that start in a runlevel. |
| cron | The system service that executes commands regularly in the future based on information in crontabs. |
| crontab (cron table) | A file specifying the commands to be run by the cron daemon and the schedule to run them. |
| crontab command | Used to view and edit user cron tables. |
| daemon process | A system process that is not associated with a terminal. |
| fg command | Used to force a background process to run in the foreground. |
| foreground process | A process that runs in your terminal and must finish execution before you receive your shell prompt. |
| getty | A program used to display a login prompt on a character-based terminal. |
| halt command | Used to quickly bring a system to runlevel 0. |
| init | The first daemon started by the Linux kernel, it is responsible for starting and stopping other daemons. |
| init command | Used to change the system runlevel. |
| insserv command | Used to enable scripts that are used to start daemons. |
| Interval-controlled daemon | A daemon that is started at a certain time on a regular basis. |
| job | See background process. |
| job ID | The ID given to a background process that may be used in commands that manipulate the process during execution. |
| jobs command | Used to view background processes in your terminal. |
| KDE System Guard | A graphical utility that may be used to view and control processes. |
| kill command | Used to send a signal to a process by PID or job ID. |
| killall command | Used to send a signal to a process by name. |
| lsof command | Used to list processes and the files that they have opened on the filesystem. |
| nice command | Used to change the priority of a process as it is started. |
| nice value | Represents the priority of a process. A higher nice value reduces the priority of the process. |
| nohup command | Used to prevent a process from stopping when the shell that started it has exited. |
| parent process | A process that has started another process. |
| Parent Process ID (PPID) | The PID of the parent process. |
| poweroff command | Used to quickly bring a system to runlevel 0 and power off the system. |
| process | A program currently loaded into memory and running on the CPU. |
| Process ID (PID) | A unique identifier assigned to every process. |
| program | A file that may be executed to create a process. |
| ps command | Used to list processes that are running on the system. |
| pstree command | Used to list processes that are running on the system as well as their parent and child relationships. |
| reboot command | Used to quickly bring a system to runlevel 6. |
| renice command | Used to change the priority of a running process. |
| runlevel | A category that describes the number and type of daemons on a Linux system. |
| runlevel command | Used to display the current and most recent runlevel. |
| shutdown command | Used to change to runlevel 0 at a certain time. |
| signal | A termination request that is sent to a process. |
| Signal-controlled daemon | A daemon that is started when an event occurs on the system. |
| sulogin | A program used to display a login prompt on a character-based terminal for the root user only in runlevel 1. |
| top command | Used to view, renice, and kill the processes on the system that are using the most CPU time. |
| user process | A process that is begun by a user and runs on a terminal. |
| YaST Runlevel Editor | A graphical program that may be used to configure the daemons that start in each runlevel. |
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