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：

1. $ dpkg -S `which cp`
   
2. coreutils: /bin/cp

下载源码：

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