$ sudo dpkg -i <packagename.deb>
//Install a downloaded Debian(Ubuntu) package~
$ sudo dpkg -r <packagename>
//Remove a Debian(Ubuntu) package~
$ sudo dpkg-reconfigure <packagename>
//Reconfigure/Repair an installer Debian(Ubuntu) package
$ uname -a
//Find out which kernel architecture is running
$ crtl+l in directory
//Show the path for that directory
$ lsof -i :<port>
//Show pid of the process that are running on these port~
$ ps ax
//Show process that are running in some conditions~
$ pv
//pipeline monitor~
$ tar -zxvf <file> -C <destiny>
//Untar file to destiny folder
$ tar -zcvf <result-name> <file or folder>
//Tar a file with result name
$ scp <source> <destiny>
//Ex: scp external-pc:/home/medicinia/wakafoo.taz.gz .
$ pkill -f indicator-datetime-service
//Restart unity ubuntu clock
//Enter Console Black Screen
crtl+alt+f4
//Exit from console black screen
ctrl+alt+f7