Thanks a lot for the explanations, I was really wondering about that.
Incidentally, I had a real reason to prefer using the `!echo...`
syntax over the `!sh -c 'echo...'` one; I need my users to define the
following alias:
git checkout $1 && git submodule foreach 'git checkout $sha1'
Due to the necessity of single-quoting the `foreach` expression, I
couldn't define it with the `!sh -c` syntax. And because of the
problems discussed in this thread, I still don't know how to have my
users define this alias.
Thanks, D.
P.S. Incidentally, this alias is addressing a pitfall in the use of
submodules that I think should not exist in the first place:
If a repo has a submodule, and head 'foo' of the repo has the
submodule's HEAD pointing to head 'foo' of its origin, while head
'bar' of the repo has the submodule HEAD pointing to head 'bar' of its
origin, checking out bar/foo on the repository leaves the submodule in
an outdated state (and `submodule update` doesn't help).
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