Process Types
When sitting at a terminal and typing in commands, the user is typically executing foreground processes. Commands such as vi are foreground processes—they read input from the keyboard and display output to the terminal. Foreground processes maintain control of the terminal, and the user cannot do anything else in that terminal window until the execution of that command is complete.
Some processes are not interactive and don’t need to run in the foreground. These are referred to as background processes or jobs. A background process gets detached from the terminal, freeing up the terminal while it is running. When a user decides to run a process in the background, you must arrange for the process to get its input from another source. ...
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