How to Check all user logged in Linux server?

We are learning how to get all logged in user name in a Linux server you need administrative privileges to execute commands cover here.

   There are many ways to list logged in user on a Linux machine. Here I am covering my three favourite  method for this purpose. All this command run with any fedora based system like Red Head Linux , Centos, Rocky Linux, Amla linux etc.

1. lastlog : you can use list command to know all login user. this command uses file available in /var/log/lastlog. This command read data from the mentioned file and present in a human readable from 

   You can use grep command to filter output and show only currently logged in user by following command.

lastlog | grep -v 'Never'

In this example we use grep -v switch to exclude all line containing Never. This way we find all currently logged in user.

2. W command : This is more preferable way to get all logged in user, it uses file mentioned on lastlog command and file situated on /proc folders. it will display more information about last login user like ip address, hostname and running program etc. Here is the screenshot after running w command without specifying any option.

If you want to see ip details you can use -i switch, here is the output while using -in switch:

3. who command: we can use who command to know the all logged in user name. it is more like w command. Here is the output of who command with -aH switch.

Here -a switch tell program to include all and -H switch instruct to include column header.

 There is one more small command which is used to know the all logged in users and it is users command. here is the screen shot after using users command.

I hope, now you understand how to get information about all logged in user. I hope you enjoyed the facts presented here. Thanks.