linux下ls，pwd，cp等源代码的下载

找到想看源码的命令属于哪个包：

$ dpkg -S `which cp`
coreutils: /bin/cp

下载源码：

$ apt-get -d source "coreutils"
Reading package lists... Done
Building dependency tree
Reading state information... Done
Need to get 12.6 MB of source archives.
Get:1 http://archive.ubuntu.com/ubuntu/ quantal-updates/main coreutils 8.13-3.2ubuntu2.1 (dsc) [2,067 B]
Get:2 http://archive.ubuntu.com/ubuntu/ quantal-updates/main coreutils 8.13-3.2ubuntu2.1 (tar) [11.7 MB]
Get:3 http://archive.ubuntu.com/ubuntu/ quantal-updates/main coreutils 8.13-3.2ubuntu2.1 (tar) [11.7 MB]
Get:4 http://archive.ubuntu.com/ubuntu/ quantal-updates/main coreutils 8.13-3.2ubuntu2.1 (tar) [11.7 MB]