Unix terminal display related issue

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http://www.unix.com – Want few input related to unix environment and terminal settings: 1. Am trying to find a way to keep the unix terminal display intact even after opening and closing a vi/less file. Currently if I open a vim file in the unix terminal and then close the file,it displays the contents of vim file on the unix terminal display, whereas I want to see the previous commands that were executed on the display (without doing the history) 2. While trying to open a file in vim, with the syntax enabled, it still displays the file in black and while only instead of in color format as per the syntax of the fi (HowTos)