This is not the last
The "last" command in Linux is a command-line utility that displays information about the last logged-in users on a system. The command can be used to display a list of all users who have logged in and out of a system, including the date and time of their login and logout, as well as the type of terminal they used to log in.
The basic syntax of the "last" command is as follows:
last [options] [username]
The command can be used with or without options, and can be used to display information about a specific user or all users. Some common options used with the "last" command include:
-w: Displays the output in a wide format, which includes the IP address of the user's host and the duration of their session.
-n: Specifies the number of lines to display. For example, "last -n 5" will display the last 5 login sessions.
-R: Displays the output in a "raw" format, which includes additional information such as the user's hostname and the device they used to log in.
Here are some examples of how to use the "last" command:
To display the last 10 login sessions for all users:
last -n 10
To display the last 5 login sessions for a specific user:
last -n 5 username
To display the last login session for all users in a wide format:
last -w
To display the last 5 login sessions for all users in a raw format:
last -n 5 -R
In addition to displaying information about login sessions, the "last" command can also be used to display information about system reboots. The command can be used with the -x option to display a list of all system reboots, including the date and time of the reboot and the type of reboot (e.g., "system boot" or "system shutdown").
last -x
The "last" command is a useful tool for system administrators, as it can provide information about when users are logging in and out of a system, as well as information about system reboots. This information can be used to troubleshoot issues, monitor security, and track user activity.
It's also important to note that this command only shows the last login session of the current running system and not the entire history of the system, for that we have to use lastlog command which shows the entire login history of all the users.
In summary, the "last" command in Linux is a command-line utility that displays information about the last logged-in users on a system. The command can be used to display a list of all users who have logged in and out of a system, including the date and time of their login and logout, as well as the type of terminal they used to log in. The command can be used with or without options, and can be used to display information about a specific user or all users. The command is a useful tool for system administrators, as it can provide information about when users are logging in and out of a system, as well as information about system reboots.
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