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In Unix-like operating systems, new processes are created by the fork() system call. The PID is returned to the parent process , enabling it to refer to the child in further function calls. The parent may, for example, wait for the child to terminate with the waitpid() function, or terminate the process with kill() .
Version 7 Unix: /etc listing, showing init and rc Version 7 Unix: contents of an /etc/rc Bourne shell script. In Unix-based computer operating systems, init (short for initialization) is the first process started during booting of the operating system. Init is a daemon process that continues running until the system is shut down.
However, if the parent process lingers in collecting the child's data (or fails to do it at all), the system has no option but keep the child's pid and termination data in the process table indefinitely. Such a terminated process whose data has not been collected is called a zombie process, or simply a zombie, in the UNIX parlance. The name is ...
In Unix and Unix-like operating systems, kill is a command used to send a signal to a process. By default, the message sent is the termination signal , which requests that the process exit . But kill is something of a misnomer; the signal sent may have nothing to do with process killing.
The UNIX operating system originated as a development of MULTICS for a single user. [40] ... [63] pid is the process identifier of the receiving process.
UTS (UNIX Time-Sharing) namespaces allow a single system to appear to have different host and domain names to different processes. When a process creates a new UTS namespace, the hostname and domain of the new UTS namespace are copied from the corresponding values in the caller's UTS namespace.
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.
Append user names in parentheses to each PID. psmisc adds the following options, among others: [2]-k, --kill Kill all processes accessing a file by sending a SIGKILL. Use e.g. -HUP or -1 to send a different signal.-l, --list-signals List all supported signal names.-i, --interactive Prompt before killing a process.-v, --verbose verbose mode-a, --all