Unix shell file copy flattening folder structureOn the UNIX bash shell (specifically Mac OS X Leopard) what would be the simplest way to copy every file having a specific extension from a folder hierarchy (including subdirectories) to the same destination folder (without subfolders)? Obviously there is the problem of having duplicates in the source hierarchy. I wouldn't mind if they are overwritten. Example: I need to copy every .txt file in th
