fortune is a simple program that displays a pseudorandom message from a database of quotations that first appeared in Version 7 Unix. The most common version on modern systems is the BSD fortune, originally written by Ken Arnold. Distributions of fortune are usually bundled with a collection of themed files, …
Read More »Reset root password in Ubuntu, Debian, Kali, CentOS or pretty much any Linux distributions
Forgetting root password is an hassle. We try to be vigilant with our security and set a complex root password. We also try not to login using directly into root account (in most production boxes) and use sudo instead. So it’s not very unlikely to loose your root password and …
Read More »Kali Linux remote SSH – How to configure openSSH server
Secure Shell (SSH) is a cryptographic network protocol for secure data communication, remote command-line login, remote command execution, and other secure network services between two networked computers. It connects, via a secure channel over an insecure network, a server and a client running SSH server and SSH client programs, respectively. …
Read More »How to use sar for monitoring your Linux system? sysstat sar examples and usage
This article describes how to install and use sar (sysstat) a system performance tools for Linux. It comes with plenty of sar examples and usage. Sar is part of the sysstat package. According to the package description it includes the following system performance tools: sar: collects and reports system activity …
Read More »Fix “WARNING: The following packages cannot be authenticated!” in Kali Linux
I just reinstalled Kali 1.0.5 and successfully did apt-get update and apt-get upgrade. But when I am trying to do an apt-get dist-upgrade I get this error “WARNING: The following packages cannot be authenticated!” Obviously I don’t want to install un-authenticated package. So I cancelled. Did some Googling and different …
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