Debian server how to update packages install sudo command and add current user to sudo group
Debian Wiki for sudo command:
wiki.debian.org/sudo
Sudo (sometimes considered as short for Super-user do) is a program designed to let system administrators allow some users to execute some commands as root (or another user). The basic philosophy is to give as few privileges as possible but still allow people to get their work done. Sudo is also an effective way to log who ran which command and when.