Tricks

copy a directory - sudo cp -R sourceDir targetDir

make an ip address static with

iface eth0 inet static
        address xxx.xxx.xxx.xxx(enter your ip here)
        netmask xxx.xxx.xxx.xxx
        gateway xxx.xxx.xxx.xxx(enter gateway ip here,usually the address of the router)
        and auto eth0 

in /etc/network/interfaces

smbclient -L localhost will show shares

apt-get install takesWildcards*

run sudo bleachbit from console

run find / -type f -size +10000k -exec ls -lh {} \; | awk '{ print $9 “: ” $5 }' to see all files > 10meg

run apt-get autoclean to remove unused packages