Linux Basic Command--useradd

Useradd (option) (parameter)     to add a user

-C "Remarks": Add note Text-D path: Specify home directory-e expiration: Specify the expiration date of the account;-F buffer days: Specify how many days after the password expires the account is closed;-G Group: Specify the group to which the user belongs;-m: Specify the user's login directory automatically ;-M: Do not automatically establish a user's login directory;-N: Cancels the establishment of a group named after the user name;-r: establishes the system account;-S Shell: Specifies the shell;-u UID used when the user is logged in: Specifies the user ID. 

Linux Basic Command--useradd