4 Answers. Theoretically you can have as many users as the user ID space supports. To determine this on a particular system check out the definition of the uid_t type. It is usually defined as unsigned int or int meaning that on 32-bit platforms you can create up to almost 4.3 billion users.

Can multiple users simultaneously access a Linux system?

Linux/Unix operating systems have the ability to multitask in a manner similar to other operating systems. … Linux was designed to allow more than one user to have access to the system at the same time.

How many users can login to Linux?

There is no limit! You could simply open multiple Terminal windows (or multiple tabs in the Terminal) and initiate multiple SSH sessions from each tab by the same user account. What if you want to change this behaviour? For example, you might want to allow only one active SSH session for an user.