When you log on to linux console, usually you see something like
web@w22 log $
comp-web : user who log in; w22 : host name ; log : current folder.
But you dont know full folder path, to show that use this command
$ export PS1="\[33[01;32m\]\u@\h \[33[01;34m\]\w \$ \[33[00m\]"
Thank to this link