uptime

shows among others 4 users, should I be worried?

According lớn man uptime

uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

Is there a way lớn find which four users are "currently logged on"?

asked May 6, năm nhâm thìn at 7:42

The easiest method lớn find who is logged on lớn your system is the use the who command, a part of the gnu coreutils package. It can be used as an ordinary user with no options or with my own favored option which enhances readability:

andrew@ilium~$ who -H
NAME     LINE         TIME             COMMENT
andrew   tty1         2016-05-06 07:34
andrew@ilium~$

At times you may see yourself or other users apparently logged in more than thở once with the use of pts/0and pts/1 in place rather than thở tty1, This indicates a 'Pseudo Terminal Slave' (= pts) and simply shows that you or another user have opened an application such as xterm, sshd or similar process that creates a pseudoterminal master and slave pairing.

More information concerning pts in the referenced AskUbuntu thread, and the man page liên kết from within the accepted answer:

  • AskUbuntu: What does “pts/” in the output of w mean?
  • pts(4) - Linux man page

answered May 6, năm nhâm thìn at 8:07

All of these answers are excessively bloated. Three characters for a command? Please.

The fastest way lớn find who's logged on and doing what is:

$ w

answered May 6, năm nhâm thìn at 9:34

2

You can use the command users lớn see who is currently logged in. Take care.

terdon

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answered May 6, năm nhâm thìn at 7:52 

who -u

It displays the username, terminal number, login date-time and IP address.

Kulfy

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answered Aug 2, 2017 at 8:01

Using who will tell you who's logged in. You can also use ps au and it will show who's logged in and what they are running.

Kulfy

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answered May 6, năm nhâm thìn at 8:11

With this command in terminal:

whoami

answered Aug 11, 2020 at 14:56

1

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