How to implement sudo without password under linux

sudo visudo

Find admin all=(all) all annotations and add them below.

admin all=(all) nopasswd: all means that users who belong to the admin group do not need to enter the password to execute sudo if it is admin all=(all) nopasswd: all is to remove the percent sign, which means that admin this user can execute sudo The advantage of this is to avoid input errors, if there is an error, you will be prompted to make an error after exiting, press e again, There will be no situation where you can't get into sudo.,It's a lot safer.。

1. First log in as the root user and create a new common user. Here we take user test as an example, <>

2. After the user is created, log in as the test user again, and run 'sudo uname' to prompt the need for sudo's password, but after entering the test password, it prompts that the test user is not in the sudo user permission group.

4. Find the line of user privilege and copy the line according to the root pattern below.

5. Then change root to test.

6. Log in again with test, execute 'sudo uname', and then enter the sudo password, ok sudo permission is done, <>

7. Then it's how to execute the sudo command without entering the password of sudo. The same file, or orange Hui under root privilege, execute visudo, add the same line that you just changed, and add nopasswd: and you're OK.

8. When you execute sudo again, it's OK, and the renderings are completed.

Summary. If you can't enter your password when using the sudo command, there could be a few reasons. First, you need to confirm that you have the appropriate permissions to use the sudo command.

Second, make sure that the password you entered is correct, as the password will not be displayed during the entry process. It is also possible that the password cannot be entered due to an issue in the system settings or configuration file. If the problem persists, I recommend that you check the system logs or contact your administrator for further assistance.

If you can't enter your password when using the sudo command, there could be a few reasons. First, you need to confirm that you have the appropriate permissions to use the sudo command. Second, make sure that the password you entered is correct, as the password will not be displayed during the entry process.

It is also possible that the password cannot be entered due to an issue in the system settings or configuration file. If the problem persists, I recommend that you check the system logs or contact the Finger Administrator for further assistance. Only the book.

Excuse me, but please go into more detail?

If Jane Oak is unable to enter the secret training code when using sudo, it may be due to permissions, wrong passwords, system settings, or configuration file issues. You can confirm permissions, check the validity of passwords, and if the problem persists, you can view the system log or contact your administrator for help.

sudo is a privileged password, and when used, it is equivalent to attaching super administrator privileges.

This seems to be limited to the sudo passwd method of invoking commands directly, right?

The sudo -i and su - toggles don't seem to be so controlled.

su to root is definitely possible to change, because su used to be root itself.

You should be careful not to allow regular users to switch to root via sudo su.

Also, you! usr bin passwd root, but it is not included! usr bin passwd root --stdin, so the password can still be changed non-interactively.

That's how I configured it, and the test is available:

root@localhost ~]# visudo

At the end of the article, add :

cmnd_alias useradmincmnds = /usr/bin/passwd, !/usr/bin/passwd root, !/usr/bin/passwd root --stdin

test all=(root) useradmincmnds

root@localhost ~]# su - test

last login: sat aug 25 10:28:09 edt 2018 on pts/1

test@localhost ~]echo "hello" | sudo passwd root --stdin

sorry, user test is not allowed to execute '/bin/passwd root --stdin' as root on

test@localhost ~]sudo passwd root

sudo] password for test:

sorry, user test is not allowed to execute '/bin/passwd root' as root on

test@localhost ~]

Note: Because sudo has banned usr bin passwd and usr bin passwd --stdin, but it continues to find bin passwd according to the path, and it has no permission on bin passwd, so an error is reported.