gitignore文件用于忽略无需追踪的文件。

配置文件：

$HOME/.config/git/ignore, $GIT_DIR/info/exclude, .gitignore

举例说明：

$ git status

# Untracked files:

    [...]

    #       Documentation/foo.html

    #       Documentation/gitignore.html

    #       file.o

    #       lib.a

    #       src/internal.o

$ cat .git/info/exclude

# ignore objects and archives, anywhere in the tree.

*.[oa]

$ git status

# Untracked files:

    [...]

    #       Documentation/foo.html

    #       Documentation/gitignore.html

$ cat .gitignore

# ignore generated html files,

*.html

# except foo.html which is maintained by hand

!foo.html

$ git status

[...]

# Untracked files:

[...]

#       Documentation/foo.html

[...]