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+---
+title: Account Creation and Deletion
+parent: Cybersecurity Linux
+grand_parent: Class Notes
+---
+# Account Creation and Deletion
+Cybersecurity Linux Lesson 2.2.1
+
+___
+### Creating User Accounts  
+To create a new user account, we use the command `useradd` followed by the username.  
+Format:
+```bash
+sudo useradd <options> <new username>
+```
+
+For example:  
+```bash
+sudo useradd john
+```
+
+### Adding More Information  
+You can change or add info to a user account with the `usermod` command. Format: 
+```bash
+sudo usermod <options> <username>  
+```
+
+For example:  
+```bash
+sudo usermod –c “John Smith” john  
+```
+This will set the user’s comment, which is often a full name, to John Smith.  
+
+Or
+```bash
+sudo usermod –g Sales john
+```
+This will add the john account into the Sales group.
+
+### Adding Groups  
+The `groupadd` command in Linux is used to create a new user group on the system.  
+Format: 
+```bash
+sudo groupadd <options> <new group name> 
+``` 
+
+For example:  
+```bash
+sudo groupadd mygroup  
+```
+Groups can be used to manage users with similar permissions or rights.
+
+### Modifying Groups  
+Groups can by modified with the `groupmod` command.  
+Format: 
+```bash
+sudo groupmod <options> <group name>  
+```
+
+For example:  
+```bash
+sudo groupmod –n supergroup mygroup  
+```
+This would change the name of an existing group from "mygroup" to “supergroup”.
+
+### Deleting User Accounts and Groups  
+To delete a user account, use the `userdel` command followed by the username. For example:  
+```bash
+sudo userdel john  
+```
+
+To delete the account plus their directories use the `–r` option:  
+```bash
+sudo userdel -r john  
+```
+
+Similarly groupdel deletes entire groups.  
+```bash
+sudo groupdel mygroup
+```
+
+### Check User Information  
+There are commands you can use to quickly check system information about a user.  
+The `id` command displays the user's unique ID, their groups and other user account properties. Use the following command:  
+```bash
+id john  
+```
+
+The `who` command displays list of logged-in users.  
+The `w` command provides detailed information about logged in users including the time they logged-in and the processes they are running