Display current login user information
Answer:
To check your Linux username, use whoami
$ whoami
john
To see your User ID (UID), Group ID (GID) and who groups you belong to, use the command id
$ id
uid=1000(john) gid=100(users) groups=33(www-data),100(users)
[...] in the shell, we can execute the command whoami to find out the current user name, we can use the function [...]