Enhance the file filtering capabilities. We now allow filtering through either pipes or pairs of temporary files. The latter appear to be mandatory for use on Windows.

#!/bin/sh

hg
hg -q
hg help
hg -q help
hg add -h
hg add --skjdfks
hg help diff
hg help status
hg -q help status
hg help foo
hg skjdfks

exit 0