Moving random files using shuf and mv - Argument list too long

I have a directory containing nearly 250K files, which are lots of files, and I want to move x random files to another directory. I searched and I got the solution of using the shuf and mv commands from here and here , so basically I am using this command $ shuf -n 5533 -e trainB/* | xargs -i mv {} testB/ But I'm receiving this error: bash: /usr/bin/shuf: Argument list too long I believe because of the large number of files, so accordingly, the argument list is too long, is there another way to do this? I'm running on SLES12 SP2.