If your vim version >= 7.3.74, you can set the vim to use the system clipboard by default by adding a line to your .vimrc:
set clipboard=unnamedplus
for the detail, see this link. Then you use the y(ank) command in vim, the content is in the system clipboard.
EDIT:
this solution and the "*y solution require the Vim that has clipboard support. Since you're lack of that, use cat/grep/less/tail... to extract the text you want to copy.