Cut a display command

From: Administrateur de systemes (sysadmin_at_DMS.UMontreal.CA)
Date: 09/20/04 

Date: Mon, 20 Sep 2004 14:23:42 GMT

Hi all gurus !

I would like to find a way to keep only the 3 last line of a command !

for example

{bash} Command

line 1
line 2
line 3
line 4
line 5
line 6

Wanted display

line 4
line 5
line 6

as a display il would like only the 3 last lines .

Thanks in advance !