User management in GNU/Linux

List all the existing users

$ cat /etc/passwd

Add new user

1. Add username first

   $ sudo useradd username
   

2. Add password

   $ sudo passwd username
   

   This will not create home directory “/home/username” to do that

3. Create user with home directory

   $ sudo useradd -m username
   

   Followed with passwd creation as above mentioned.

4. Adding home/directory after creating user

/home/Android/Sdk

$ mkhomedir_helper username
```

Changing the shell of user

$ grep username /etc/passwd

--> username:x:1003:1003::/home/username:/bin/sh

Here the user has “/bin/sh” as shell.

Changing it to Bash.

$ usermod --shell /bin/bash username

Login with new user

$ su - username 

Enter the user password and login.

Removing the user

$ sudo deluser --remove-home eric

Error:

While logging into new account ls, cat, clear the basic commands were not working. On Root it was working but not in new user.

Solution:

1. Have a root access.

$ su
$ root@host$ 

2. Update the .bashrc file on other user (newuser)

cd into

root$ cd /home/newuser

Open .bashrc file of newuser

root$ nano .bashrc

Add this

export PATH="$PATH:/bin"
export PATH="$PATH:/usr/bin"

3. Login to newuser

root$ su - newuser
## Enter password

4. Update the source file

newuser# source ~/.bashrc

5. Wolaah! commands should work now.