Unix Command to Display Directories as Tree

Here is the command you can use to Display  Unix Directories like Tree structure, exactly like you use Tree command in windows which will give a similar out put like

N20:/data1/maxim/user01/mytest $ ls -R | grep ":$" | sed -e 's/:$//' -e 's/[^-][^\/]*\//--/g' -e 's/^/   /' -e 's/-/|/'
   .
   |-test1
   |-test2
   |-test3
   |-index