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Virtual Box and Alt/Tab Keys

I use virtual box for all my testing activities. It comes too often that I have a virtual box VM window open & I want to switch to my host machine to see some stuff like tutorials etc.. If you press the alt+tab combination it just works inside the VM & doesn't switches to host machine. In these scenarios you can press the host key once ( not hold it ) & then whatever you press goes to host machine. So in general where host key is the default Right Ctrl, just press Right Ctrl once & now press the alt+tab & it will switch you out to host machine. This is really helpful when you have the VM windows open or you're working on seamless mode.
Hope it help others too.

Set date and time in Linux

There are few ways to set the date and time on Linux command line. In order to do this, you must login as root and execute the following methods as follow: For you to remember the syntax, issue the command “date” first [root@linuxtechtips ~]# date Mon Aug 20 18:30:29 SGT 2012 Let say you want to change it to Sept 6, 2012, 3pm, just follow the pattern above [root@linuxtechtips ~]# date 090615002012 Thu Sep  6 15:00:00 SGT 2012 where as:
09 = month (September) 06 = day 15 = hour 00 = min 2012 = year
Now it’s set, as simple as that:
[root@linuxtechtips ~]# date Thu Sep  6 15:00:01 SGT 2012
Another example, you want it to change to 20th of December, 2012, 10:45pm [root@linuxtechtips ~]# date 122022452012 Thu Dec 20 22:45:00 SGT 2012 Viola!!! [root@linuxtechtips ~]# date
Thu Dec 20 22:45:03 SGT 2012
Now if you want to challenge yourself, then you can use this as well:
Using our example date above, use the date command with –set or -s options
[root@linuxtechtips ~]# date -s "6 Sept 2012 15:00:00" Th…

Install and Configure Config Server Firewall (CSF) on Ubuntu Linux

Introduction Config Server Firewall (or CSF) is a free and advanced firewall for most Linux distributions. In addition to the basic functionality of a firewall – filtering packets – CSF includes other security features, such as login/intrusion/flood detections. CSF includes UI integration for cPanel, DirectAdmin and Webmin, but this tutorial only covers the command line usage. CSF is able to recognize many attacks, such as port scans, SYN floods, and login brute force attacks on many services. It is configured to temporarily block clients who are detected to be attacking the cloud server.
The full list of supported operating systems and features can be found on ConfigServer's website.
This tutorial is written for Debian based distro, such as Debian and Ubuntu but should work on RHEL/CentOS also. The commands should be executed with root permissions, by logging in as root, or initiating a root shell with the following command if sudo is installed:
sudo su Features Config Server Firewall …