A method in the shell script to convert the input password to * (asterisk) _linux shell

If you need to write a section to interact with the user, and need to input some sensitive information (for example: User password, license, etc.), the direct use of printf+read, the user input information will be displayed on the screen, which is not in line with information security, and the customer experience is not professional, So you need to convert the password entered by the user to * with the following style:

Please input your passwd:1234
Modified to:
Please input your passwd:****

So specifically how to achieve it, please look down ...

#!/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 '