直接上腳本了，利用printf實現(xiàn)，里面有個小bug，后續(xù)待解決。

  #!/bin/bash  Times=600  while true  do  printf " ${Times}s"  Times=$((${Times}-1))  if [ ${Times} -eq 0 ]  then   exit 0  fi  sleep 1  printf "r"  printf "r"  done

to be continue…….