一顿操作就完事了：

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures

$ touch test

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures

$ mkdir test2

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures

$ mkdir pro

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures

$ mv test pro/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures

$ mv test2/ pro/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures

$ ls

AlbumArt_{B5020207-474E-4720-2C44-A52C91F98700}_Large.jpg

AlbumArt_{B5020207-474E-4720-2C44-A52C91F98700}_Small.jpg

AlbumArtSmall.jpg

'Camera Roll'/

desktop.ini

Folder.jpg

pro/

'Saved Pictures'/

Screenshots/

timg.jpg

'WaveSideBar-master (1)'/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures

$ cd pro/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro

$ git init

Initialized empty Git repository in C:/Users/lieyun_android/Pictures/pro/.git/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git add .

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git commit -m "提交初始化工程"

[master (root-commit) ec330cb] 提交初始化工程

1 file changed, 0 insertions(+), 0 deletions(-)

create mode 100644 test

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git rm test

rm 'test'

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ ls

test2/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git commit -m "删除仓库和本地文件"

[master dfe5e12] 删除仓库和本地文件

1 file changed, 0 insertions(+), 0 deletions(-)

delete mode 100644 test

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git rm -r --cached test2/

fatal: pathspec 'test2/' did not match any files

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ cd test2/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro/test2 (master)

$ touch tt

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro/test2 (master)

$ git add .

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro/test2 (master)

$ git commit -m "test2文件夹新增文件tt"

[master 594e6d8] test2文件夹新增文件tt

1 file changed, 0 insertions(+), 0 deletions(-)

create mode 100644 test2/tt

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro/test2 (master)

$ cd ..

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git rm -r --cached test2/

rm 'test2/tt'

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git commit -m "删除仓库关联文件夹test2"

[master 8f26183] 删除仓库关联文件夹test2

1 file changed, 0 insertions(+), 0 deletions(-)

delete mode 100644 test2/tt

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ ls

test2/

lieyun_android@DESKTOP-JM7KND2 MINGW64 ~/Pictures/pro (master)

$ git status

On branch master

Untracked files:

(use "git add ..." to include in what will be committed)

test2/

nothing added to commit but untracked files present (use "git add" to track)

So, 重点就是：