20161101l04-04 old boy Linux OPS training-linux system user and User group management-02

Front User Group

Add User Group command

Groupadd

We just need to remember some common parameters.

Groupadd-g 8888 Syz #添加 GID 888 user Group

View grep syz/etc/group after adding complete

The point is, passwd, this command.

Used to change the password

Passwd-d This is the delete password

With passwd This command, root can change any user's password, and is not required to lose the original password

Password for other user passwords, and can only change their own password

Passwd-l lock account, cannot log in, cannot change password

Passwd-u unlock

SSH is not allowed to log in with a blank password by default

Here is a combined parameter

Passwd-n 7-x 80-w 10-i #解释是 Minimum seven days, maximum 80 days to change the password. There are 10 days to send a warning, after expiration 40 prohibit login

Last parameter stdin

echo "FADLFJ" |passwd--stdin root #通过管道更改密码, no hint, one effect

20161101l04-04 old boy Linux OPS training-linux system user and User group management-02