Linux Troubleshooting Make Easy.

Linux Learning & Troubleshooting Make Easy.

Useradd command in Linux

useradd - Create a new user or update default new user information

Changing the default values:

When invoked with the -D option, useradd will either display the current default values, or update the default values from the command line. The valid options are

-b default_home
    The initial path prefix for a new user's home directory. The user's name will be affixed to the end of default_home to create the new directory name if the -d option is not used when creating a new account.




-e default_expire_date
    The date on which the user account is disabled.

-f default_inactive
    The number of days after a password has expired before the account will be disabled.

-g default_group
    The group name or ID for a new user's initial group. The named group must exist, and a numerical group ID must have an existing entry .

-s default_shell
    The name of the new user's login shell. The named program will be used for all future new user accounts.

-G group,[...]
    A list of supplementary groups which the user is also a member of. Each group is separated from the next by a comma

-d home_dir
    The new user will be created using home_dir as the value for the user's login directory. The default is to append the login name to default_home and use that as the login directory name.

-c comment
    The new user's password file comment field.

-u uid
    The numerical value of the user's ID. This value must be unique, unless the -o option is used. The value must be non-negative.

-p passwd
    The encrypted password, as returned by crypt(3). The default is to disable the account.



Example:

#  useradd jerry -u 555 -g admin -G dataadmin,weadmin -s /sbin/nologin -c "System admin"


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