How to find out about active sessions of other users on the server?

To view active sessions of other users on the server, you can use the following commands:

• who: Shows who is currently logged in, where they logged in from, and when.
• w: Provides the same information as who, but also shows what processes the users are running.
• last: Displays the login and logout history of users.
• finger <username> (if the service is installed): Provides information about a specific user, including their last activity.
• /var/log/wtmp: Log file containing information about all user logins and logouts. It can be viewed using the last command.
• /var/log/auth.log or /var/log/secure (depending on the distribution): Log files containing authentication attempt information.

Usage examples:

# Show current users
who

# Show current users and their processes
w

# Show login history of all users
last

# Show information about a specific user (if finger is installed)
finger johndoe