gitignore

# no .a files
*.a

# but do track lib.a, even though you're ignoring .a files above
!lib.a

# only ignore the TODO file in the current directory, not subdir/TODO
/TODO

# ignore all files in the build/ directory
build/

# ignore doc/notes.txt, but not doc/server/arch.txt
doc/*.txt

# ignore all .pdf files in the doc/ directory
doc/**/*.pdf

使用两个星号（*) 表示匹配任意中间目录，比如 a/**/z 可以匹配 a/z , a/b/z 或 a/b/c/z 等。