SHELL

linux move all files up a directory

mv myfolder/* .

Move all files from a folder in linux

mv source_path/* destination_path/

here you have to put forward slash and * after source path so that it will take files inside source_path instead of the complete source directory.
The above command moves all files (unless they are hidden) in the source directory to the destination directory.

move all files from one directory to another

mv /path/sourcefolder/* /path/destinationfolder/

Move All files in a Directory

        if (System.IO.Directory.Exists(sourcePath))
        {
            string[] files = System.IO.Directory.GetFiles(sourcePath);

            // Copy the files and overwrite destination files if they already exist.
            foreach (string s in files)
            {
                // Use static Path methods to extract only the file name from the path.
                fileName = System.IO.Path.GetFileName(s);
                destFile = System.IO.Path.Combine(targetPath, fileName);
                System.IO.File.Copy(s, destFile, true);
            }
        }
        else
        {
            Console.WriteLine("Source path does not exist!");
        }