Moving a process into the background involves pressing ^Z (Control+Z). This won't stop the output of your background program, but it will free up the shell to do other things. It is probably better in most cases to open another instance of the shell instead so that output from the running process won't disrupt your workflow.. Terminal emulators almost all support tabs, and at the very least you can run more than one terminal emulator. If you are on the console (As in, not on an Xorg-controlled "terminal.") then I recommend using a program like screen or tmux to make invoking a new shell easier.
To bring a process in the background back into the foreground, you type in fg. Note this is to be typed only on the shell instance the process is backgrounded on. Other shells won't have a clue what to do if you're trying to invoke fg and there's no job in the background.
fg [job id]where [job id] is the job number associated with the process. You can find the job id by issuing the jobs command.
With the top command.
You can check what processes are running in the background by using system monitoring tools like Task Manager (Windows), Activity Monitor (Mac), or htop (Linux). These tools display a list of active processes, including both foreground and background tasks. Additionally, you can check for background processes in your system's settings or using command-line tools such as top or ps.
Any Linux/Unix process that runs in the background is called a 'daemon' process. The word derives from the Greek meaning "worker".
Ctrl-C
k is not a standard command in Linux.
There is no such command. Obviously, in order to enter a command into the prompt, Linux must already be on.
In a Linux terminal, the command to create a new directory is: mkdir .
Processes aren't "deleted", they are "killed." The "kill" command, followed by the process ID number, should kill the process. Most distros also have a "killall" command, which will kill processes that have the name you specified.
Types of ProcessesThere are generally three types of processes that run on Linux. Interactive processes are those processes that are invoked by a user and can interact with the user. VI is an example of an interactive process. Interactive processes can be classified into foreground and background processes. The foreground process is the process that you are currently interacting with, and is using the terminal as its stdin (standard input) and stdout (standard output). A background process is not interacting with the user and can be in one of two states - paused or running. The following exercise will illustrate foreground and background processes.1. Logon as root.2. Run [cd \]3. Run [vi]4. Press [ctrl + z]. This will pause vi5. Type [jobs]6. Notice vi is running in the background7. Type [fg %1]. This will bring the first background process to the foreground.8. Close vi.The second general type of process that runs on Linux is a System Process or Daemon (day-mon). Daemon is the term used to refer to process' that are running on the computer and provide services but do not interact with the console. Most server software is implemented as a daemon. Apache, Samba, and inn are all examples of daemons.Any process can become a daemon as long as it is run in the background, and does not interact with the user. A simple example of this can be achieved using the [ls -R] command. This will list all subdirectories on the computer, and is similar to the [dir /s] command on Windows. This command can be set to run in the background by typing [ls -R &], and although technically you have control over the shell prompt, you will be able to do little work as the screen displays the output of the process that you have running in the background. You will also notice that the standard pause (ctrl+z) and kill (ctrl+c) commands do little to help you.Automatic or batch processes are not connected to a terminal. Rather, these are tasks that can be queued into a spooler area, where they wait to be executed on a FIFO (first-in, first-out) basis. Such tasks can be executed using one of two criteria:· At a certain date and time: done using the at command, which we will discuss in the second part of this chapter.· At times when the total system load is low enough to accept extra jobs: done using the batch command. By default, tasks are put in a queue where they wait to be executed until the system load is lower than 0.8. In large environments, the system administrator may prefer batch processing when large amounts of data have to be processed or when tasks demanding a lot of system resources have to be executed on an already loaded system. Batch processing is also used for optimizing system performance.
In Linux the chmod command is used to set file permissions.
Nothing. Helo is not a recognized command in linux.