rsync scp rcp

rsync相比于scp有性能优势，会对文件进行检验，决定哪些文件需要拷贝，哪些已经存在不用拷贝。

scp比rcp更安全。

rsync was originally written as a replacement for rcp and scp.

 

参考:

http://en.wikipedia.org/wiki/Rsync