Maybe the '-u' option would be of interest $ mv -u /home/username/username/* /home/username/
From mv manual: -u, --updatemove only when the SOURCE file is newer than the destination file or when the destination file is missing
Maybe the '-u' option would be of interest $ mv -u /home/username/username/* /home/username/
From mv manual: -u, --updatemove only when the SOURCE file is newer than the destination file or when the destination file is missing