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Process identifier. In computing, the process identifier (a.k.a. process ID or PID) is a number used by most operating system kernels —such as those of Unix, macOS and Windows —to uniquely identify an active process. This number may be used as a parameter in various function calls, allowing processes to be manipulated, such as adjusting the ...
netstat. In computing, netstat (network statistics) is a command-line network utility that displays network connections for Transmission Control Protocol (both incoming and outgoing), routing tables, and a number of network interface (network interface controller or software-defined network interface) and network protocol statistics.
In multitasking computer operating systems, a daemon (/ ˈdiːmən / or / ˈdeɪmən /) [1] is a computer program that runs as a background process, rather than being under the direct control of an interactive user. Traditionally, the process names of a daemon end with the letter d, for clarification that the process is in fact a daemon, and ...
Unix, Unix-like, Plan 9, Inferno, KolibriOS, IBM i. Platform. Cross-platform. Type. Command. License. Plan 9: MIT License. In most Unix and Unix-like operating systems, the ps (process status) program displays the currently-running processes. The related Unix utility top provides a real-time view of the running processes.
Proportional–integral–derivative controller. A proportional–integral–derivative controller (PID controller or three-term controller) is a feedback -based Control loop mechanism commonly used in industrial control systems and various other applications requiring continuously modulated control. A PID controller continuously calculates an ...
Named pipe. In computing, a named pipe (also known as a FIFO for its behavior) is an extension to the traditional pipe concept on Unix and Unix-like systems, and is one of the methods of inter-process communication (IPC). The concept is also found in OS/2 and Microsoft Windows, although the semantics differ substantially.
systemd is a system and service manager for Linux operating systems. systemctl is a command to introspect and control the state of the systemd system and service manager. Not to be confused with sysctl. systemd-analyze may be used to determine system boot-up performance statistics and retrieve other state and tracing information from the system ...
Windows service. In Windows NT operating systems, a Windows service is a computer program that operates in the background. [1] It is similar in concept to a Unix daemon. [1] A Windows service must conform to the interface rules and protocols of the Service Control Manager, the component responsible for managing Windows services.