First flattering steps

Now you know what is unix and where it come from now jumping to the one of its distro (distribution)
we will be using UBUNTU  for beginning steps you can get it from here
  installation steps are even simpler

so lets start

LOGGING IN:
while installation you must have been asked for the user name and password just enter that n you are logged in
after getting logged in you will be able to get who you are

 $ who am i

 this command tells kernel to retrieve the information about you and displays it on screen

 $who

 this command is more powerful then above one . It displays data about all the users logged into the system

for today that was the learning part now come to smart facts 

before you turn over to the nextchapters where you are going to meet a plethora of commands , remember a few things that apply to all Unix commands

• All Unix commands must always be entered in small case letters
• Between the command name and the options that may be available with the command there must always be space or tab. FOR example, ls -l . Here ls is the command whereas -l is the option and the two have been separated by a space

• Two or more options are available then then they can usually be combined. For example ,ls -a -l is same as ls -al

• To cancel entire command before you press enter , press del key