CentOS Linux System Information - Login History

Last

command to get the information of the user who has successfully logged into Linux system.
last command will refer to binary files of /var/log/wtmp and display the result to screen.

Synopsis

Last

Last username

Note

If last command used without specify any username, it will show login of all users.

Example A: Showing login history of all users

#last
lee pts/3 192.168.139.1 Thu Jan 21 11:16 still logged in
jane pts/4 192.168.139.1 Thu Jan 21 11:27 - 11:37 (00:10)
root pts/3 192.168.139.1 Thu Jan 21 11:14 - 11:16 (00:01)
root pts/2 Thu Jan 21 11:07 still logged in
root pts/1 Thu Jan 21 11:07 still logged in
root :0 Thu Jan 21 11:07 still logged in
reboot system boot 2.6.9-42.ELsmp Thu Jan 21 10:52 (00:24)
root pts/2 Wed Jan 20 22:00 - down (00:00)
root pts/1 Wed Jan 20 21:59 - down (00:01)
root :0 Wed Jan 20 21:59 - down (00:02)
reboot system boot 2.6.9-42.ELsmp Wed Jan 20 21:57 (00:04)

From the above example, we know the details of the login information as below

jane is login at 11:27 21th Jan and she logut 10 mins later at 11:37

jane pts/4 192.168.139.1 Thu Jan 21 11:27 - 11:37 (00:10)
username terminal hostname or ip login time and date logout time time of usage

Example B: Showing login history of root user

# last root
root pts/3 192.168.139.1 Thu Jan 21 11:14 - 11:16 (00:01)
root pts/2 Thu Jan 21 11:07 still logged in
root pts/1 Thu Jan 21 11:07 still logged in
root :0 Thu Jan 21 11:07 still logged in
root pts/2 Wed Jan 20 22:00 - down (00:00)
root pts/1 Wed Jan 20 21:59 - down (00:01)
root :0 Wed Jan 20 21:59 - down (00:02)
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