I have graphical machine of rhel7 , when i run who command , the output of 4th column is ':0' , what does that mean? When my other machine take access of this graphical machine , the output of who commands 4th column is ip address of the machine that took the graphical machine's ssh , please explain why so.
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The fourth column (comment column) is actually the column, as you have said, that displays the IP address of the machine through which the user has logged in. Meaning of ':0' is that the IP address of the machine is localhost and nothing else. Which means the user is logged in from the same machine where the OS is installed and not any other machine in the network
Edit: I must say that this site does not work like the way you used it. You should have made thorough research attempts and then you should have posted this question. A simple google search gave me this http://linoxide.com/linux-command/linux-who-command/
Pranjal
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man whoandwho -H.. You are like walking through all the columns. – Mingye Wang Oct 15 '15 at 13:35whoonly outputs 4 cols and I think this question is the last one. – Mingye Wang Oct 15 '15 at 13:41:0as well. – Mingye Wang Oct 15 '15 at 14:21