is there any command or variable in emacs, that it will displays the
number for every line at the beginning of it???
Don't google first. Try Emacs Wiki first:
http://www.emacswiki.org/cgi-bin/wiki/Search. You'll find pages like this one:
http://www.emacswiki.org/cgi-bin/wiki/LineNumbers.
Actually, try Emacs itself first, for help. Unfortunately, vanilla Emacs can't
display line numbers at the beginnings of lines, so Info and M-x apropos won't
get you far on this one.
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