Run the program : dispatch applications to hardware through the kernel to perform their operations (user interface required)
User interface: A unique application that provides users with automatic and other application mechanisms
< Span lang= "en-US" style= "Background-color:inherit;" xml:lang= "en-US" > CLI:
< Span lang= "en-US" style= "Background-color:inherit;" xml:lang= "en-US" > Shell: sh,csh,ksh,bash.zsh.tcsh, Span style= "background-color:inherit;font-family: ' The song Body '; > provide command prompt ,
GUI : Start the application by clicking the gnome,kde,xfce
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System Hierarchy of Linux