They key is that these two types of processes involve human input through some sort of terminal control. Interactive processes and batch jobs are not daemons even though they can be run in the background and can do some monitoring work. When I was a full-time system administrator, I often ran disk usage inventories, system behavior analysis scripts, and so on, at night. System backups, for example, are usually run at night since the daytime workers aren’t using the system. These are best at times when the system usage is low. Interactive processes are those which are run by a user at the command line are called interactive processes.īatch processes are processes that are not associated with the command line and are presented from a list of processes.
In Linux, there are three types of processes: interactive, batch and daemon. At a particular instant of time, it can be either running, sleeping, or zombie (a process that completed its task, but waiting for its parent process to accept the return value). It is said that a daemon has no controlling terminal.Ī process is a running program. Picture for representational purpose onlyĪgain, a daemon is a process that runs in the background and is usually out of the control of the user. The pstree output is a pretty good illustration as to what is going on with your machine. You may not know what some of them are, or what they do, they are listed. You will see a complete listing of all of the processes that are running. Open up a terminal and type in this command: pstree The pstree command is a handy little utility that shows the processes currently running on your system and it show them in a tree diagram. These are useful programs in their own right – they have a specific purpose, but to see all of the daemons running on your machine, the pstree command will suit our discussion better. They can be seen in process listings through ps, top, or htop. There are many ways to catch a glimpse of a running daemon. It’s a general Linux rule that the names of daemons end this way. To identify a daemon, look for a process that ends with the letter d. What Daemons are Running on Your Machine? Because daemons do the bulk of their work in the background, they can appear a little mysterious and so, perhaps difficult to identify them and what they actually do. There are many daemons that run on a Linux system, each specifically designed to watch over its own little piece of the system, and because they are not under the direct control of a user, they are effectively invisible, but essential. Daemons perform certain actions at predefined times or in response to certain events.
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