dwim-shell-command with template prompts

from blog lmno.lol @alvaro, | ↗ original
Somewhat recently, I wanted to quickly create an empty/transparent png file. ImageMagick's convert has you covered here. Say you want a transparent 200x400 image, you can get it with: convert -verbose -size 200x400 xc:none empty200x400.png Great, I now know the one-liner for it. But because I'm in the mood of saving these as seamless command-line...