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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