Git不會顯示有一個文件上修改後的文件

Question

差異，git st得到：

# On branch master 
# Changes not staged for commit: 
# (use "git add <file>..." to update what will be committed) 
# (use "git checkout -- <file>..." to discard changes in working directory) 
# 
# modified: lib/ABC/Main.pm 
# 
no changes added to commit (use "git add" and/or "git commit -a") 

git diff得到：

diff --git a/lib/ABC/Main.pm b/lib/ABC/Main.pm 
old mode 100755 new 
mode 100644 

git diff HEAD得到相同的。

添加文件後，git diff什麼也沒有顯示。

git diff HEAD得到：

diff --git a/lib/ABC/Main.pm b/lib/ABC/Main.pm 
old mode 100755 
new mode 100644 

如何顯示從git的差異只是正確的差異？

Answer 1

這是因爲Main.pm的唯一更改是文件權限。文件內容沒有差異。