Shell脚本中实现把输入的密码转换为*（星号）的方法

#!/bin/sh


getchar() {

  stty cbreak -echo

  dd if=/dev/tty bs=1 count=1 2> /dev/null

  stty -cbreak echo

}


printf “Please input your passwd: ”


while : ; do

  ret=`getchar`

  if [ x$ret = x ]; then

    echo

    break

  fi

  str=”$str$ret”

  printf “*”

done


echo “Your password is: $str”