<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (November 2010) (Learn how and when to remove this template message) </Td> </Tr> <P> Single user mode is a mode in which a multiuser computer operating system boots into a single superuser . It is mainly used for maintenance of multi-user environments such as network servers . Some tasks may require exclusive access to shared resources, for example running fsck on a network share . This mode can also be used for security purposes - network services are not run, eliminating the possibility of outside interference . On some systems a lost superuser password can be changed by switching to single user mode, but not asking for the password in such circumstances is viewed as a security vulnerability . </P> <P> Unix - like operating systems provide single user mode functionality either through the System V - style runlevels, BSD - style boot - loader options, or other boot - time options . </P> <P> The runlevel is usually changed using the init command, runlevel 1 or S will boot into single user mode . </P>

Single user mode shell runs as in unix
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