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<body class='hmmessage'><div dir='ltr'><span style="color: rgb(51, 51, 51); font-family: UbuntuRegular, Ubuntu, 'Bitstream Vera Sans', 'DejaVu Sans', Tahoma, sans-serif; font-size: 14px; line-height: 18.2000007629395px; background-color: rgb(255, 255, 255);">GNU/Linux is 'Unix-like' operating system,what is the similarities and dissimilarities between 'Unix-like' and 'Unix-based' ? what is the similarities and dissimilarities between 'Unix' and 'GNU/Linux' ?</span> </div></body>
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