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    Get Process ID of Linux Foreground and Background Processes

    The PID (process identification number) is a serial number (starting from 1) given by the operating system to uniquely identify the process.

    Every process started either by the operating system or by the user gets a PID in order of their invocation by the kernel. If we start the same process several times, it will be assigned different PID numbers each time.

    Which command will bring a background process in foreground?

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    • Every process gets some memory allocated to it and CPU usage based on its priority. 

    Note: For a better understanding you can go through these Processes, Shell Function Library topics also.

    The first process started by the kernel is the init process which consequently gets a process ID of 1. All the PIDs are visible/displayed in the process table.

    The types of processes we see in the process table are:

    • Foreground Processes: These processes are user dependent.

      If the foreground processes are run from the terminal, the shell prompt remains unavailable and will be available only when the foreground process is terminated or stopped.

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