Kernel is one who all the job and shell is one with whome you interface. 'file'
utility tells type of file like text, word or pdf. • Helpful when Different desktops –
gnome, kde, windows-maker. – Gnome or Kde more Change password- '
passwd', 'yppasswd', 'kpasswd' . No sharing of password, even with your project
-mates. Introduction of Unix 1. what is the difference between the passwd and yppasswd utilities