unpack.sh - Snippet that splits into sample files and answer files.

unpack.sh

#!/bin/sh

i=1

bodyname="sample"

test -f "$bodyname$i.txt" && rm -f "$bodyname$i.txt"

test -f "$1" && exec <"$1"

sed -ne '
s/^  *$//
H
$ {
  g
  s/^\n*//g
  s/\n*$//g
  s/\(\n\n\)\n*/\1/g
  p
}
' | while read l; do
  if ! echo "$l" | grep '^ *$' > /dev/null; then
    echo $l >> "$bodyname$i.txt"
  else
    if [ "$bodyname" == "sample" ]; then
      bodyname="answer"
    else
      bodyname="sample"

      i=`expr $i + 1`
    fi

    test -f "$bodyname$i.txt" && rm -f "$bodyname$i.txt"
  fi
done