如何touch一个目录及其下所有嵌套子目录中的文件？
find . | xargs touch
或者
find ./ -type f |xargs touch find ./ -typed |xargs touch 就可以了。
-type c
File is of type c:
b block (buffered) special
c character (unbuffered) special
d directory
p named pipe (FIFO)
f regular file
l symbolic link
s socket
D door (Solaris)
