You want to use the -newermt option for find:

find /media/WD/backup/osool/olddata/ -newermt 20120101 -not -newermt 20130101

to get all the files with modification time in 2012.

Uppy fetches files locally and from remote places like Dropbox or Instagram. With its seamless integration, reliability and ease of use,

Uppy is truly your best friend in file uploading.

Git Large File Storage (LFS) replaces large files such as audio samples, videos, datasets, and graphics with text pointers inside Git, while storing the file contents on a remote server like GitHub.com or GitHub Enterprise.

What you want is:

cp -R t1/. t2/

The dot at the end tells it to copy the contents of the current directory, not the directory itself. This method also includes hidden files and folders.

This document describes a set of features that can interactively do things with buffers and files. All the features are described here in detail.

The Ido package can let you switch between buffers and visit files and directories with a minimum of keystrokes. It is a superset of Iswitchb, the interactive buffer switching package by Stephen Eglen.