Linux Learning -11-learning Linux account Management

User identifier: UID and GID

General user's password forgot: This is the most easy to solve, please system administrator Help, he will reset your password and do not need to know your old password! Use the passwd command as root to process it.

Root password Forgotten: Restart into the single-player maintenance mode (20th), the system will give the root of the active bash interface, at this time to change the password by passwd, or to mount the root directory after the Live CD to modify the/etc/shadow, will be inside the root of the secret After the Code field is emptied and then restarted, root will log in without a password! Log in and then quickly use the passwd command to set the root password.

Active groups, initial groups

Input groups Display Support Group, the first is a valid group

NEWGRP: Switching of active groups

NEWGRP + Group Name change active Group exit exit restore

Account Management

New and removed:

USERADD-G User name plus group name

Useradd-r User Name Add admin account

Unable to log in need to set password passwd

passwd user name does not add user name to set their own password

Chage Detailed Password parameters

Usermod Account Tuning

Userdel account removed-R along with the home directory delete

Temporarily do not start the account:/etc/shadow account expiration date (eighth field) is set to 0 can be used to make the account unusable

"Find/-user username" After finding the archive one by one delete

Add and remove groups

Groupadd Group Name

Groupmod Group Parameter Tuning

Groupdel Removing a group

GPASSWD: Group Administrator features

GPASSWD GroupName

Account Management-work together

SGID the Seventh chapter

Linux Learning -11-learning Linux account Management