Homebrew/homebrew — pull request #32416 by saysjonathan (2014-09-19 00:09:20+00:00)
Title: Fix submodule checkout substitution for POSIX shells

The substitution used in the submodule checkout command does not work when `/bin/sh` is a real POSIX shell (such as pdksh.) This change fixes the substitution so it will work with all shells.