How to Create a Non-Interactive System User with useradd in Linux

The 'useradd' command is used to create a new user account on a Linux system. In this case, the command is creating a new user account named 'zabbix' with the following options:

• '-r' creates a system account, which is used for running services or daemons on the system.
• '-M' tells the command not to create a home directory for the user.
• '-s /sbin/nologin' sets the login shell for the user to '/sbin/nologin', which means the user cannot log in interactively.

So, the command 'useradd -r -M -s /sbin/nologin zabbix' creates a system account named 'zabbix' that cannot log in interactively and does not have a home directory.