This is a command all Linux administrators should know, because they are the people in charge of creating users accounts, this will be one of three different posts about managing users.
useradd, creates a new user or update default new user information.
useradd [options] LOGIN
Some of its options are:
useradd -g primary_grp -G admin -s /bin/shell -p xxxx -d /home/user -m user
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