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Whenever you quit a program or, in some cases, when it completes the task you ve asked of it, it will terminate itself. This means ending its own process and also that of any other processes
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CHAPTER 16 TAKING CONTROL OF THE SYSTEM
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it created in order to run. The main process is called the parent, and the ones it creates are referred to as child processes.
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Tip You can see a nice graphical display of which parent owns which child process by typing pstree at
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the command-line shell.
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While this should mean your system runs smoothly, badly behaved programs sometimes don t go away. They stick around in the process list. Alternatively, you might find that a program crashes and so isn t able to terminate itself. In very rare cases, some programs that appear otherwise healthy might get carried away and start consuming a lot of system resources. You can tell when this happens because your system will start slowing down for no reason, as less and less memory and/or CPU time is available to run actual programs. In all of these cases, the user usually must kill the process in order to terminate it manually. This is easily done using top. The first task is to track down the crashed or otherwise problematic process. In top, look for a process that matches the name of the program, as shown in Figure 16-2. For example, the Firefox web browser generally runs as a process called firefox-bin.
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Figure 16-2. You can normally identify a program by its name in the process list.
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Caution You should be absolutely sure that you know the correct process before killing it. If you get it
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wrong, you could cause other programs to stop running.
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Because top doesn t show every single process on its screen, tracking down the troublecausing process can be difficult. A handy tip is to make top show only the processes created by the user you re logged in under. This will remove the background processes started by root. You can do this within top by typing u, and then entering your username. Once you ve spotted the crashed process, make a note of its PID number, which will be at the very left of its entry in the list. Then type k. You ll be asked to enter the PID number. Enter that number, and then press Enter once again (this will accept the default signal value of 15, which will tell the program to terminate).
CHAPTER 16 TAKING CONTROL OF THE SYSTEM
With any luck, the process (and the program in question) will disappear. If it doesn t, the process you ve killed might be the child of another process that also must be killed. To track down the parent process, you need to configure top to add the PPID field, for the parent process ID, to its display. To add this field, type f, and then b. Press Enter to return to the process list. The PPID column will appear next to the process name on the right of the window. It simply shows the PID of the parent process. You can use this information to look for the parent process within the main list of processes. The trick here is to make sure that the parent process isn t something that s vital to the running of the system. If it isn t, you can safely kill it. This should have the result of killing the child process you uncovered prior to this.
Caution If the PPID field in top displays a value of 1, that means the process doesn t have a parent
process. In both the PPID and PID fields, you should always watch out for low numbers, particularly one-, twoor three-digit numbers. These are usually processes that started early on when Linux booted and that are essential to the system.
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