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Chapter 19. Using the Terminal > Process Management

19.2. Process Management

Each command you invoke or program that you run from a Terminal window becomes a child of that terminal's shell. The Terminal window can juggle many child processes at once, but only one at a time is foregrounded, writing its output (through the Unix standard output file handle) to the Terminal, and accepting keyboard input (via Unix standard input) from the user. Any other processes are either backgrounded, running but not displaying any interface or accepting input, or suspended, paused in the process of execution.

You can control the foregrounded application by sending it Unix signals via the keystrokes listed in Table 19-1. Programs usually respond to them as listed, though individual programs may interpret them differently. (The Emacs text editor, for example, ties a text-searching function to the Control-S keystroke.)


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