fix document.
add revert command for git.
Revert "fix document."

This reverts commit 60f3aae96020c25b63479a10eebb6ee0d028cfa9.
Revert "fix commit behavior."

This reverts commit 47c1360ea33d2e5c10fb68a92e3c467f46642483.
Revert "fix default args."

This reverts commit 1f99cde110febc38da9023e606c107aa66d18ecf.
Revert "add file_rec source."

This reverts commit dec3726c9ad6561a0bf9425cdd56f33d0c9398bb.
fit revert command.