我可以jpg使用以下方法获取所有图像：
find . -name "*.jpg"
但是我怎样才能将png文件添加到结果中呢？
如何使用 GNU find 命令一次匹配多种文件类型（一个搜索命令）？
手册页说：
-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; this is never true if the -L option or the -follow
option is in effect, unless the symbolic link is broken. If
you want to search for symbolic links when -L is in effect, use
-xtype.
s socket
D door (Solaris)
我想搜索文件 ( f) 和符号链接 ( l …