Shell Programming and Scripting

#!/bin/sh

MOVE=""
BASE="folder1"

# using ls instead of find, since ls sorts.  -r reverses the sort.
ls -r "${BASE}" | while read DIR
do
        TXT=""  ;       PDF=""  ;       TOOMANY=0

        DIR="${BASE}/${DIR}"

        # Skip things in base folder that aren't dirs
        [ -d "$DIR" ] || continue

        if [ ! -z "$MOVE" ]
        then
                # Move contents of $MOVE into $DIR, then skip $DIR

                # Remove the echo from these once you're sure it does
                # what you want
                echo mv "${MOVE}"/* "${DIR}"
                echo rmdir "${MOVE}"
                MOVE=""

                # Remove the continue if you want the domino effect
                continue
        fi

        for FILE in "${DIR}"/*
        do
                case "$FILE" in
                *.txt)  [ -z "$TXT" ] || TOOMANY=1
                        TXT="$FILE"
                        ;;
                *.pdf)  [ -z "$PDF" ] || TOOMANY=1
                        PDF="$FILE"
                        ;;
                *)      echo "$FILE not txt or pdf?"
                        ;;
                esac
        done

        [ -z "$TXT" -o -z "$PDF" ] && echo "Warning, not enough files in $DIR"

        if [ "$TOOMANY" -gt 0 ]
        then
                # Too many files in $DIR, set MOVE var for next loop
                MOVE="${DIR}"
        fi
done