oprand % python

print 14 % 5

output:: 4

why?

because 14 - 4 = 10 / 5 - will have no remaining part

install java on ubuntu

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

apache enable/disable site

a2ensite/a2dissite

Apache2 NameVirtualHost *:80 has no VirtualHosts

comment in ports.conf
#NameVirtualHost *:80

check apache version

apache2 -v

change user password in batch mode

echo root:asd12qniqsdq | chpasswd

Immediate Windows restart from command line

shutdown -t 0 -r -f with administrator rights