![]() ![]() Foreground processes receive keyboard-generated input and signals, and are allowed to read from or write to the terminal (e.g., via stdin and stdout).Ī process session is created when a terminal or console first opens (e.g., at login or by invoking a new terminal instance). ![]() The terminal device ID (tty) is the process’s controlling terminal. With job control, commands can be selectively suspended, resumed and run asynchronously, allowing the shell to return for additional commands while the child process can run.Ī foreground process is a command running in a terminal window. When the shell prompt redisplays, the parent shell returns. Without job control, a parent shell forks a child process to run a command, sleeping until the child process exits. Jobs and sessions: Job control is a command shell feature allowing a single shell instance to run and manage multiple commands. The output may appear chronological, but this is not guaranteed unless explicitly stated –O, –sort options are used. The display order matches that of the system process table, which reuses table rows as processes die and new ones are created.
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