Sudo

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sudo lets a normal user do some things they might need root for without being root

visudo let's you edit who can do what

examples: 

 root    ALL=(ALL) ALL
 someuser ALL=(ALL) ALL
 someuser ALL= NOPASSWD: /usr/sbin/somescriptyouwantorun
 someuser ALL= NOPASSWD: /bin/someotherscript
 someotheruser ALL= NOPASSWD: /bin/rm
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