this is jast a linux cp command.
It's io usage is half of harddisk. Prevent system busy when copying large file.
git clone https://github.com/libinzhangyuan/low_io_cp.git
cd low_io_cp
$ make
Copy low_io_cp to any place. Then you can use it by:
$ /your/path/low_\io_cp /path/filea /path2/fileb
or your can copy it to /bin. then you can use just like a command:
$ low_io_cp filea fileb