<b_jonas> slashlearn farbfeld//zzo38\'s Farbfeld utilities is a package of command-line programs (with rather strange command-line syntax) for manipulating images in a specific raw format called farbfeld. It\'s somewhat underdocumented. http://zzo38computer.org/fossil/farbfeld.ui/home

OLD="wisdom/$1"; [ -z "$1" ] && OLD="$(lastfiles)"; NEW="${OLD}s"; if [ -f "$NEW" ]; then echo "«${NEW}» already exists"; exit 1; fi; mv "$OLD" "$NEW" && echo "«${OLD}» -> «${NEW}»"