linux cp 命令的使用疑问,该怎么解决

linux cp 命令的使用疑问
大家好，我有一堆文件，想快速复制。

我举个例子：

主文件夹为main，
其下面有folder1/folder11/folder111/x.txt
folder2/folder22/folder222/folder2222/y.txt

当然这些子文件夹中可能还有其他文件。

请问如何写cp命令，使之只复制*.txt文件，并且保持目录结构。
可能处在不同的文件夹中的txt文件可能有相同的文件名，也要保证给出警告。

[解决办法]

Perl code

zhblue@240x:~/tmp$ find../target./main./main/folder2./main/folder2/folder22./main/folder2/folder22/y.txt./main/folder1./main/folder1/forlder11./main/folder1/forlder11/x.txt./main/folder3zhblue@240x:~/tmp$ find main -name *.txt -exec cp --parents {} target \;zhblue@240x:~/tmp$ find../target./target/main./target/main/folder2./target/main/folder2/folder22./target/main/folder2/folder22/y.txt./target/main/folder1./target/main/folder1/forlder11./target/main/folder1/forlder11/x.txt./main./main/folder2./main/folder2/folder22./main/folder2/folder22/y.txt./main/folder1./main/folder1/forlder11./main/folder1/forlder11/x.txt./main/folder3