Rsync is available by default on Apple OS and can be used to validate the transfer  of files from a Mac workstation. Use rsync's advanced alternative for the cp command and especially when copying larger number of files. 

Command:

$ rsync -P -v -r source/ destination 

Options:

• source/ : Must include ending slash to select all files within the source directory to be moved.
• The -P option is the same as --partial --progress, which keeps partially transferred files and shows a progress bar during transfer.  ‘–progress’ option displays the files and the time remaining to complete the transfer.
• -v : verbose. Will provide more information such as on what files are being skipped.

• -r : copies data recursively, ie subfolders, but does NOT preserve timestamps and permission while transferring data. NB: When left out, even if there are no subfolders to recurse, nothing happens and will get a "skipping directory" error message.
•  -a : archive mode, allows copying files recursively and retains timestamps but it also preserves symbolic links, file permissions, user & group ownerships. NB: this may be problematic when transferring between folders with different users groups/permission. Recommended to only use when logged in as Admin.
  
• -h : human-readable, output numbers in a human-readable format

Example: