How to view the information of past login users in Linux environment?

In the Linux environment, we can view the information of past logged in users by using some commands. The Linux system will record the historical information of user login, including login time, login IP address, and the terminal used for login.

The following are some commonly used commands to view the information of past logged-in users:

1. last command

The last command is used to display the user’s login record, Including information such as user name, login IP address, and login time. For example, enter the following command to display the login records of all users in the system:

last

If you want to display the login records of a specific user, enter the following command:

last username

2. lastlog command

The lastlog command is used to display the latest login information of all users in the system. Enter the following command to view the recent login information of all users in the system:

lastlog

3. Use the auth.log file

The system will save the login details in /var /log/auth.log file. You can use the grep command combined with keywords to search for the required information. For example, enter the following command to view the login information of a certain user:

grep "username" /var/log/auth.log

The above are some common methods to view the information of past login users in the Linux system. Through these commands, you can easily understand the login information of users in the system. situation, and troubleshoot security issues.

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