linux add user to sudoers

Purpose: Create an ftp user on a Linux system and restrict the user's access through ftp. The main directory is "/", and the upper-level directory is not displayed. For example, I want to create a user usertest with the password usertest. The main directory is/home/mpsp/ftp/usertest. Operating System: RedHatEnterpriseLinuxServerrelease5.4 (Tikanga) ftp: vsftp fir

254: Pass the public key to the SSH serverSsh-copy-id [email protected]//upload key pairSSH Server 50[[email protected] ~]# ls ~/.sshAuthorized_keysSSH Server 50 Disable password Authentication loginVim/etc/ssh/sshd_configBayi passwordauthentication No//disable password Authentication login: Wq#systemctl Restart sshdClient 254: Test key pair Authentication Login#ssh [email protected]//Do not enter a password to connect directly#ssh [email protected]//no connection allowed+++++++++++++++++++++++

As shown, create a new user Masterbai under root privileges, and add some information to the/etc/passwd fileIn this file, the user information of the server, such as the red box user, is the user we created, and up to 2-25 of the users, belonging to the system users (in

User management is one of the tasks of Linux system maintenance, in which simple actions such as adding and deleting users are designed.Requirements: Add a lot of users at once. In a text file.Format: In the unit of behavior, each line is a user information. The user name an

syntax for account creation or update of new user information: useradd [-c comment] [-d home_dir] [-e expire_date] [ -f Inactive_time] [-g initial_group] [G-group[,....] [-m [-K Skeleton_dir] | -m] [-s shell] [-u uid[-o][-n][-r] login] useradd-d [-G default_ Group] [-B default_home] [-f default_inactive] [-e default_expire_date] [-s Default_shell] Description: New account creation When the class= parameter is not added -d "kw", the useradd instructio

try to add sudo and try again. sudo requires us to provide a user password. Please note: It asks you to provide your password, not the root password. Finally, we opened the/etc/sudoers file. In this way, it is not fun to perform a command that only the root user can manipulate without knowing the root user's password.

switch to root identity, if a user accidentally leaked the root password, it is not very insecure system? No mistake, in order to improve this problem, yielded the sudo command. A command that executes a root with sudo can be done, but requires a password that is not the root password but the user's own password. By default only the root user can use the sudo command, the normal

Purpose: Create an ftp user on a linux system and restrict the user's access through ftp. The main directory is "/", and the upper-level directory is not displayed.For example, I want to create user usertest with the password usertest, and the main directory is/home/mpsp/ftp/usertest.Operating System: Red Hat Enterprise Linux