User account management script in Bash Scripting - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the basic command to add a new user in a bash script?

The basic command is useradd username. It creates a new user account named 'username'.

beginner

How can you set a password for a new user in a bash script?

You can set a password by using echo 'username:password' | chpasswd. This updates the password for 'username'.

intermediate

Why should you check if a user already exists before adding them in a script?

To avoid errors or overwriting existing accounts. Checking prevents duplicate users and script failures.

beginner

What command removes a user and their home directory in a bash script?

Use userdel -r username to delete the user and their home directory safely.

intermediate

How can you add a user to a group in a bash script?

Use usermod -aG groupname username to append the user to the specified group.

Which command creates a new user account in bash?

A passwd

B useradd

C usermod

D userdel

useradd is used to create new user accounts. passwd sets passwords, usermod modifies users, and userdel deletes users.

How do you safely delete a user and their home directory?

A rm -rf /home/username

B userdel username

C userdel -r username

D deluser username

userdel -r username deletes the user and their home directory. Just userdel leaves files behind.

What does the -aG option do in usermod?

A Adds user to a group without removing from others

B Deletes user from a group

C Creates a new group

D Changes user's primary group

-aG appends the user to the specified groups without removing existing group memberships.

Why check if a user exists before adding in a script?

A To avoid duplicate users and errors

B To speed up the script

C To delete old users

D To change the password

Checking prevents creating duplicate users and avoids script errors.

Which command sets a user's password in a script?

A passwd username

B useradd -p password username

C usermod -p password username

D echo 'username:password' | chpasswd

Using echo 'username:password' | chpasswd sets the password non-interactively in scripts.

Explain the steps to add a new user with a password and add them to a group using a bash script.

Think about safety checks and commands for user creation, password setting, and group assignment.

Describe how to safely remove a user and their home directory using a bash script.

Consider commands and safety checks to avoid leftover files.