在項目的某次修改中，可能包括添加、刪除、更新了一些文件，結果并不好。這時想要丟棄這些修改。
這些變動包括2中類型：

• tracked file(s)
• untracked file(s)

使用git clean來清理untracked files

執行git 命令：

$ git clean -df

清理tracked files

執行這些命令：

$ git checkout . #本地所有修改的。沒有的提交的，都返回到原來的狀態$ git stash #把所有沒有提交的修改暫存到stash里面。可用git stash pop回復。$ git reset --hard HASH #返回到某個節點，不保留修改。$ git reset --soft HASH #返回到某個節點。保留修改

help information

NAME

• git-clean - Remove untracked files from the working tree

SYNOPSIS

• git clean [-d] [-f] [-i] [-n] [-q] [-e ] [-x | -X] [–] …?

DESCRIPTION

Cleans the working tree by recursively removing files that are not under version control, starting from the current directory.

Normally, only files unknown to Git are removed, but if the -x option is specified, ignored files are also removed. This can, for example, be useful to remove all build products.

If any optional … arguments are given, only those paths are affected.

OPTIONS

-d
Remove untracked directories in addition to untracked files. If an untracked directory is managed by a different Git repository, it is not removed by default. Use -f option twice if you really want to remove such a directory.

-f
–force
If the Git configuration variable clean.requireForce is not set to false, git clean will refuse to delete files or directories unless given -f, -n or -i. Git will refuse to delete directories with .git sub directory or file unless a second -f is given.

-i
–interactive
Show what would be done and clean files interactively. See “Interactive mode” for details.

-n
–dry-run
Don’t actually remove anything, just show what would be done.

-q
–quiet
Be quiet, only report errors, but not the files that are successfully removed.

-e
–exclude=
In addition to those found in .gitignore (per directory) and $GIT_DIR/info/exclude, also consider these patterns to be in the set of the ignore rules in effect.

-x
Don’t use the standard ignore rules read from .gitignore (per directory) and $GIT_DIR/info/exclude, but do still use the ignore rules given with -e options. This allows removing all untracked files, including build products. This can be used (possibly in conjunction with git reset) to create a pristine working directory to test a clean build.

-X
Remove only files ignored by Git. This may be useful to rebuild everything from scratch, but keep manually created files.

總結

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