Shulou(Shulou.com)06/02 Report--

First, user management 1. User created usage:

Useradd [options] LOGIN

Options and examples:

-u specify UID when creating a user

-o with-u option, do not check the uniqueness of UID

-g GID: indicates the basic group to which the user belongs, which can be the group name or GID

-c "COMMENT": user's comment information

-d HOME_DIR: home directory with the specified path (which does not exist)

-s SHELL: indicates the user's default shell program, and the available list is in the / etc/shells file

-G GROUP1 [, GROUP2,...]: indicates an additional group for the user, which must exist in advance

-N does not create a private group as the primary group, but uses the users group as the primary group

-r: create system user CentOS 6: ID

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