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  2. Process identifier - Wikipedia

    en.wikipedia.org/wiki/Process_identifier

    In some APIs, PID 0 is also used as a special value that always refers to the calling thread, process, or process group. [3] [4] Process ID 1 is usually the init process primarily responsible for starting and shutting down the system. Originally, process ID 1 was not specifically reserved for init by any technical measures: it simply had this ...

  3. fuser (Unix) - Wikipedia

    en.wikipedia.org/wiki/Fuser_(Unix)

    Prompt before killing a process.-v, --verbose verbose mode-a, --all Display all files. Without this option, only files accessed by at least one process are shown.-m, --mount Same as -c. Treat all following path names as files on a mounted file system or block device. All processes accessing files on that file system are listed.

  4. Proportional–integral–derivative controller - Wikipedia

    en.wikipedia.org/wiki/Proportional–integral...

    In many cases, the manipulated variable output by the PID controller is a dimensionless fraction between 0 and 100% of some maximum possible value, and the translation into real units (such as pumping rate or watts of heater power) is outside the PID controller. The process variable, however, is in dimensioned units such as temperature.

  5. netstat - Wikipedia

    en.wikipedia.org/wiki/Netstat

    Also show PID and to which program each socket belongs, e adds extra info like the user. Run as root to see all PIDs. netstat -s: Shows network statistics. netstat -r: Shows kernel routing information. This is the same output as route -e. netstat -i: Displays a table of all network interfaces. Add -e to get output similar to ifconfig. netstat -ct

  6. Linux namespaces - Wikipedia

    en.wikipedia.org/wiki/Linux_namespaces

    The first process created in a PID namespace is assigned the process ID number 1 and receives most of the same special treatment as the normal init process, most notably that orphaned processes within the namespace are attached to it. This also means that the termination of this PID 1 process will immediately terminate all processes in its PID ...

  7. Process group - Wikipedia

    en.wikipedia.org/wiki/Process_group

    In a POSIX-conformant operating system, a process group denotes a collection of one or more processes. [1] Among other things, a process group is used to control the distribution of a signal; when a signal is directed to a process group, the signal is delivered to each process that is a member of the group.

  8. PID - Wikipedia

    en.wikipedia.org/wiki/PID

    PID controller (proportional-integral-derivative controller), a control concept used in automation; Piping and instrumentation diagram (P&ID), a diagram in the process industry which shows the piping of the process flow etc. Principal ideal domain, an algebraic structure; Process identifier, a number used by many operating systems to identify a ...

  9. Process control block - Wikipedia

    en.wikipedia.org/wiki/Process_control_block

    A process control block (PCB), also sometimes called a process descriptor, is a data structure used by a computer operating system to store all the information about a process. When a process is created (initialized or installed), the operating system creates a corresponding process control block, which specifies and tracks the process state (i ...