Question

What should I write in my .vimrc file to test whether I am running vim or gvim.

Because the colorscheme I like very much is beautiful in vim, but is ugly in gvim. So I want it that when I am in vim, I use this aforementioned colorscheme, and when I am in gvim, use another colorscheme.

Is there any vimscript code can implement this function?

Answer 1

These two pages have a lot of info on color schemes and how to switch them:
http://vim.wikia.com/wiki/Switch_color_schemes
http://www.indelible.org/ink/vim-colorschemes/

It also features the issue you have:

if has('gui_running')
    " GUI colors
    colorscheme foo
else
    " Non-GUI (terminal) colors
    colorscheme bar
endif