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su (Unix)
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<p>The <a href="/facts/Unix/0pNL2seI">Unix</a> command su, which stands for 'substitute user' (or historically 'superuser'), is used by a computer user to execute commands with the privileges of another user account. When executed it invokes a <a href="/facts/Shell_(Unix)/2G4T2Fb9">shell</a> without changing the current working directory or the user environment. </p><p>When the command is used without specifying the new user id as a <a href="/facts/Command_line/R9JpGmXQ">command line argument</a>, it defaults to using the <a href="/facts/Superuser/0Brr6ol7">superuser</a> account (user id 0) of the system. </p>