How can I merge two folders with the same or different names with subdirectories, using shell script or terminal. Also, if there is a file with the same name, then it should skip.
To merge "dir2" into "dir1," I would expect the following to do what you want:
cp -nr dir2/* dir1/
The -r switch means copy recursively, and the -n switch means don't overwrite existing files (i.e., skip files with the same name).