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Front User GroupAdd User Group commandGroupaddWe just need to remember some common parameters.Groupadd-g 8888 Syz #添加 GID 888 user GroupView grep syz/etc/group after adding completeThe point is, passwd, this command.Used to change the passwordPasswd-d This is the delete passwordWith passwd This command, root can change any user's password, and is not required to lose the original passwordPassword for other user passwords, and can only change their own passwordPasswd-l lock account, cannot log in

Operational commands for some Linux usersUseradd Creating a userAddUser Creating a userpasswd Password Change commandUsermod Change the user name, and the user directoryUserdel Deleting a userID shows the user uid and GIDGroupadd Creating a user groupGroupdel Deleting a user groupGroupmod changing user group name informationGroups displays the group to which the user belongs/etc/skel When a user creates a new user and defaults to the location of the configuration/etc/login.defs is used to define

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/wKiom1ed5UbwkvKjAAHU-XzUyaw119.png "title=" 7.png " alt= "Wkiom1ed5ubwkvkjaahu-xzuyaw119.png"/>650) this.width=650; "src=" Http://s1.51cto.com/wyfs02/M02/85/3D/wKioL1ed5XOQi1YMAAGWPqHx9Zk325.png "title=" 8.png " alt= "Wkiol1ed5xoqi1ymaagwpqhx9zk325.png"/>CP,RM,MV Differences in inode usageCP: Allocating idle inode numbersRM: When deleting data, the inode is deleted first and data is temporarily not deletedMV: On the same file system, the data does not move, just change the inodeWhen not on the

Or is that sudo and su?When you log in with Su, add the following-Because of this, the environment variable will become the switch user'sThis can cause unnecessary trouble if you do not use environment variables.General Sudo is not allowed for remote logins, because passwords are plaintext and are very insecureBut you can use ssh-t [email protected] sudo-l this way to log inOkay, I'm done.20161129l04-09 old boy Linux OPS training-linux system user and