#adduser

How to Create a User Account Without useradd Command in Linux?

There are three commands are available in Linux to create an user account.

Did you ever tried to create a user account in Linux using manual method?

I mean to say without using an above three commands.

If you don’t know how to do that? we are here to help you on this and will show you in details.

Have you wondering, how it’s possible? If yes, don’t worry, as we have mentioned many times that…

Create a new user in Linux

Table of Contents: Adding new user Changing Password User Login Switch User Granting Admin Privileges User Aliases Reloading Aliases Testing Conclusion >Adding new user:Creating new user with the name "testuser" shown as below. # useradd testuser

> Changing Password:Creating password for newly created  user ( ie., testuser )# passwd testuserChanging password for user testuser. New UNIX password: # set passwordRetype new UNIX password: # confirmpasswd: all authentication tokens updated successfully.

> User Login:Login with newly created user ( ie., testuser ).  localhost login: testuser  # Enter user-name .password:                          #  Enter  testuser password ( Password  will not be display ) Then press Enter.

> Switch user:We can switch between users by using 'su' command. the below example is switch to root user.su  - l  $ su -l root      # switch user to root , if we did not type  any username then it will take root user by default . ie., we can login to root by using 'su - ' as well.Password:                      # Enter root password#                    # we have logged into root user. the '#' indicates that we are now using root user.

>Granting Administrative Privileges:Assigning administrative privileges to a user to execute root commands without switching to root user. ( ie., testuser ) # usermod -G wheel testuserEdit '/etc/pam.d/su' file. the file looks like as below.# vi /etc/pam.d/su#%PAM-1.0 auth sufficient pam_rootok.so # Uncomment the following line to implicitly trust users in the "wheel" group. #auth sufficient pam_wheel.so trust use_uid # Uncomment the following line to require a user to be in the "wheel" group. #auth required pam_wheel.so use_uid auth substack system-auth auth include postlogin account sufficient pam_succeed_if.so uid = 0 use_uid quiet account include system-auth password include system-auth session include system-auth session include postlogin session optional pam_xauth.so

Un Comment the below lines from the file."auth sufficient pam_wheel.so trust use_uid" "auth required pam_wheel.so use_uid"The file will be looks like below.# vi /etc/pam.d/su#%PAM-1.0 auth sufficient pam_rootok.so # Uncomment the following line to implicitly trust users in the "wheel" group. auth sufficient pam_wheel.so trust use_uid # Uncomment the following line to require a user to be in the "wheel" group. auth required pam_wheel.so use_uid auth substack system-auth auth include postlogin account sufficient pam_succeed_if.so uid = 0 use_uid quiet account include system-auth password include system-auth session include system-auth session include postlogin session optional pam_xauth.so

> User aliases: Creating an alias for the root user and forwarding all root user emails another user. ( ie., testuser ) # vi /etc/aliasesuncomment the last line and enter the username as shown below.root: testuser

> Reloading aliases: # newaliases

> Testing:Try to login to root user from testuser. in general, it should ask for the password. but testuser having root privileges so that we can login without entering any password like a root user.$ su -l root #

adduser : Linux Command- Create New User account

What is adduser command? In Linux, a ‘useradd‘ command is a low-level utility that is used for adding/creating user accounts in Linux and other Unix-like operating systems. The ‘adduser‘ is much similar to useradd command, because it is just a symbolic link to it. To create a new user account under any Linux distribution use command called useradd. The system administrator is responsible for…

Answer: How can I create an administrator user from the command line? #it #development #fix

How can I create an administrator user from the command line?

I want to create a user with administrative privileges and all the regular setups like home directory.

Is there a adduser parameter to give the user sudo powers automatically?

What are the default settings for adduser? Will it automatically create home directories and all the other things without extra parameters? (i.e. is adduser

Ubuntu 사용자 추가

adduser <#UserId#>

그렇게 추가한 사용자로 로그인한 후 sudo 명령어로 root 권한을 얻으려 할 때 <#UserId#> is not in the sudoers file. This incident will be reported. 라면서 root 권한을 얻지 못한다면_!?

응_? sudoers 파일은 뭐지… ( 당황. 바로 검색. )

결론은 대략 sudo 명령어에 대한 설정을 다루는 파일이고 추가한 사용자에 대한 정보를 수정해줘야 한다는 것.

root로 로그인한 후 ( 관리자 권한이 필요한데 sudo 가 안되니깐… )

visudo -f /etc/sudoers 로 파일을 열고

sudoers 파일의 경우 일반 vi 가 아닌 visudo 를 쓰는데 저장할 때 문법 체크도 해준다고 한다.

root ALL=(ALL:ALL) ALL 다음 라인에 <#UserId#> ALL=(ALL:ALL) ALL을 넣어준다.

저장하면 끝

출처

http://thisok.org/amina/print.php?bo_table=Linux&wr_id=122

adduser <<user name>>

/etc/ssh/sshd_config에서 PasswordAuthentication no를 yes로 변경 후 

service ssh restart

ssh user_name@host

-- 회고

학생때 실습해보았던 것이나, 실무에선 매번 계정 신청하고 받기만 한것이 익숙해지니 까먹었나보다.

ssh key 생성하여 해당 키로 인증하는 방법을 설명한걸 참고했다가, 인증서 관리가 더 안될것 같아 패스워드 인증을 어떻게 하지 찾아보니..