Quick way to indent copy-paste buffer?

Question

A lot of times I want to copy some error message and paste it into some web form indented by 2 or 4 spaces. Is there a quick way to modify the contents of my copy-paste buffer to add an N-space indent?

Currently I open vim, paste into vim, indent, copy back out of vim, paste into the destination, then close vim.

Answer 1

I came up with this one-liner using xsel to indent the clipboard by 2 spaces:

$ xsel -b | sed -e's/^/  /' | xsel -b --input

You can replace the " " in the sed expression with whatever number of spaces/tabs or other prefix you want.