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#!/bin/bashset -eu -o pipefail git init -q module1(cd module1  touch this  mkdir subdir  touch subdir/that  git add .  git commit -q -m c1  echo hello >> this  git commit -q -am c2) git init with-submodules(cd with-submodules  mkdir dir  touch dir/file  git add dir  git commit -m "init"   git submodule add ../module1 m1  git commit -m "add module 1"   git submodule add ../module1 dir/m1)