1
Add --include option (opposite of --exclude).
3
Look into sdiff improvement here:
4
http://www.pkix.net/~chuck/sdiff2.diff
6
Propagate stderr from subprocess so that diff3 does
7
a better job of explaining _why_:
8
> $ diff3 /bin/sh /bin/false /bin/mv
9
> diff3: subsidiary program `diff' failed (exit status 2)