Check the currently logged in username in linux

Method 1: Execute the command whoami

[root@test01 ~]# whoami

The results are as follows:

root

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Method 2: Execute the command lastlog

[root@test01 ~]# lastlog

The results are as follows:

Username Port From Latest root pts/0 10.0.0.1 Fri Aug 31 09:11:19 +0800 2018 bin **Never logged in** daemon **Never logged in** adm **Never logged in** lp **Never logged in** sync **Never logged in** shutdown **Never logged in** halt **Never logged in** mail **Never logged in** operator **Never logged in** games **Never logged in** ftp **Never logged in**

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