Shows progress of a copy

pc.sh

#!/bin/bash
function myhelp() {
  printf "Usage:\n\t$(basename $1)";shift;printf " $*" >/dev/stderr
  exit 1
}
[ $# -lt 2 ] && myhelp $0 "<source> <destination>\n
  Calculates %% complete of a copy from <source> to <destination>
  Can be started before (or after) <destination> exists.\n\n"
pcsrc=$(du -bsL "$1" | cut -f1)
pcdst=1
while [[ $pcsrc -gt $pcdst ]];do
  pcdst=$(du -bsL "$2" 2>/dev/null| cut -f1)
  printf "\r$2: $(((pcdst*100)/pcsrc))%%"
  sleep 0.2
done
echo