gistfile1.sh

#!/bin/sh

SOURCE=$1
DEST=$2

if [ ! -e "$SOURCE" -o ! -e "$DEST" ] ; then
	echo "USAGE: dialogcp file dest"
	exit 0
fi

copy_file() {
	SIZE_KB=`du -k $SOURCE |cut -f1`
	OFFSET=0

	if [ $SIZE_KB -le 100 ] ; then
		BS=1
	else
		BS=$(($SIZE_KB / 100))
	fi

	while test $OFFSET -lt $SIZE_KB ; do
		dd if="$SOURCE" bs=${BS}k skip=$OFFSET count=1 2>/dev/null
		OFFSET=$(($OFFSET + $BS))
		PERCENT=$((100 * $OFFSET / $SIZE_KB))
		echo "$PERCENT" >&2
	done
}

copy_file 2>&1 > "$DEST" | dialog --gauge "Copying $SOURCE to $DEST..." 0 0