The Tip: vim -c allows you to run commands you would normally type after vim had started with :cmd at the time vim starts but doesn't rely on having the commands persisted in your .vimrc file.
Usage: When you start vim from the command line, use vim -c 'cmd'. For instance (and this is based on a post from superuser.com) vim file1 -c 'split file2' opens file1 and file2 in a horizontal split. You can even chain them together as shown in the link to superuser.com.
What Is It Good For?: For when you want to start vim with commands run that aren't used enough by default to warrant inclusion in to .vimrc. You could also use a shell alias like alias vimsplit='vim -c "split"' to open vim with split windows instead the usual default of one.
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