No arguments
Description:
Start a foreach...done block, that iterates over all images in the selection, with a separate local environment for each one.
Example of use:
sample colorful,earth,duck,dog foreach[^2] +blur 10 sub normalize 0,255 done

Command: sample colorful,earth,duck,dog foreach[^2] +blur 10 sub normalize 0,255 done

Command: sample colorful,earth,duck,dog foreach[^2] +blur 10 sub normalize 0,255 done

Command: sample colorful,earth,duck,dog foreach[^2] +blur 10 sub normalize 0,255 done

Command: sample colorful,earth,duck,dog foreach[^2] +blur 10 sub normalize 0,255 done