Enable `-s` with no input text to read previous command output

[tk755]

Using $ q -s without any additional input text should take the previous shell command output as input text.

This can be used to fix outputs and read errors without explicitly stating them like so:

$ git push
fatal: The current branch dev has no upstream branch.
To push the current branch and set the remote as upstream, use

    git push --set-upstream origin dev

To have this happen automatically for branches without a tracking
upstream, see 'push.autoSetupRemote' in 'git help config'.
$ q -s
git push --set-upstream origin dev