We ask people not to cross-postask people not to cross-post, not that it helps much. If it's posted on both sites, flag it here with a link to the other site's version. If we think it's way better here we'll ask the other site to close their version, but usually we close ours and tell the asker they need to pick one site
replaced http://unix.stackexchange.com/ with https://unix.stackexchange.com/