## Looping

`vipsthumbnail` can process many images in one command. For example:

    $ vipsthumbnail *.jpg

will make a thumbnail for every jpeg in the current directory. See the Output directory section below to see how to change where thumbnails are written.

`vipsthumbnail` will process images one after the other. You can get a good speedup by running several `vipsthumbnail`s in parallel, depending on how much load you want to put on your system. For example:

    $ parallel vipsthumbnail ::: *.jpg