Even if browsers didn't allow changing the clipboard, there's still this older problem: http://thejh.net/misc/website-terminal-copy-paste http://thejh.net/misc/

Even if browsers didn't allow changing the clipboard, there's still this older problem: http://thejh.net/misc/website-terminal-copy-paste http://thejh.net/misc/website-terminal-copy-paste The solution is definitely to avoid pasting commands with newlines in them into your terminal. With Vim, you can use the + register to paste (e.g. "+p). Using iTerm on OS X, I've added a custom keymap for Cmd+V, bound to Run coprocess: pbpaste | tr -d "\n" which filters out the newlines.