Заменить/удалить длинный, нежелательный текст во всех коммитах в истории Git

git_filter_branch.md

str=$(cat <<'EOF' xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx EOF )

git filter-branch --tree-filter "find . -name '*.php' -exec sed -i '' -e 's/$str/REMOVED/g' {} ;"\

Также линк для более подробной инфы: https://help.github.com/articles/remove-sensitive-data/