A major feature of Unix-like operating systems is their robustness. That is, they can operate for prolonged periods (sometimes years) without crashing (i.e., stopping operating) or requiring rebooting (i.e., restarting). And although individual application programs sometimes crash, they almost always do so without affecting other programs or the operating system itself.

Robustness is something that should be designed into software from the ground up; it is not something that can be successfully tacked on at a later date. The lack of advance planning for robustness is a major factor in the numerous security and stability problems that plague some non-Unix-like operating systems.

Rozumiem, że "pewność działania" dotyczy tego serwisu.