.
├── html
└── md

#! /bin/bash
# run this from a folder containing markdown files
# it delivers html to the sibling html folder
if hash pandoc 2>/dev/null; then
  for file in ./*.md ; do
    echo Converting $file
    cat "$file" | pandoc -o "$(echo $file | sed 's/^./../html/' |  sed 's/.md$/.html/')"
  done
else
  echo "I need pandoc installed"
fi

if [  $# -gt 0 ]; then
  pandoc $file --template=$1 -o "../html/${file%md}html"
else
  pandoc $file -o "../html/${file%md}html"
fi

for file in *.md; do
    pandoc -o ../html/${file%md}html
done

../html/%.html: %.md
    pandoc -o $@ $<