Find user login history – last and lastb commands in Linux

last and lastb commands print the user login history. last prints the previous logged in users and lastb shows the failed login attempts.

October 3, 2018

Dovecot: imap Error: open (/var/mail/username) failed

Resolution of the error Dovecot: imap Error: open (/var/mail/username) failed observed on a Postfix mail server site.

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October 3, 2018

System calls and functions associated with execution times under Linux and Unix operating systems are explained.

September 24, 2018

How to display the graphical output of a program to a remote user with the X-Window System server running on the remote host.

September 22, 2018