There are a number of jpg images (nominally 10 000 PCs), each 512 by 512 pixels.
Required command-line utility under Windows to glue them joint to joint in one piece, i.e. in my case 100 by 100 pictures (with the final size to 51200 51200 pixels). Gluing is not a panorama, just one to the other, like a mosaic. Know that it is possible through Photoshop or through, for example, Xnview, but need is console solution. Please advise.