Shell Programming and Scripting

#!/bin/bash
PWORD=
ANYKEY=0
echo -n "Password:  "
until [ -z "$ANYKEY" ]
do
    read -N 1 -s ANYKEY
    echo -n "*"
    PWORD="$PWORD$ANYKEY"
done
echo
echo $PWORD
exit

#!/bin/bash

passwd=""
omodes=$(stty -g)

printf "Enter Password: "
while :
do
   stty raw -echo
   c=$(dd bs=1 count=1 2>/dev/null)
   stty -raw

   # break out of loop if CR found
   [[ -z $(echo $c | tr -d "\015") ]] && break

   stty echo
   printf "*"
   passwd=${passwd}${c}
done

stty $omodes

printf "\nPassword entered: $passwd\n"

#! /usr/bin/ksh
exec 4>/dev/tty
function getpass
{
  typeset prompt=$1
  typeset backspace=$(echo  \\b\\c)
  typeset enter=$(echo \\r\\c)
  typeset savesetting=$(stty -g)
  typeset keystroke password n i reading result
  n=0
  echo "${prompt}"\\c >&4
  stty -echo -icrnl -icanon min 1 time 0
  reading=1

  while ((reading)) ; do
    keystroke=$(dd bs=1 count=1 2>/dev/null)
    case $keystroke in
          $enter) reading=0
                  ;;
      $backspace) if ((n)) ; then
                    echo "${backspace} ${backspace}"\\c >&4
                    ((n=n-1))
                  fi
                  ;;
               *) echo \*\\c >&4
                  data[n]=$keystroke
                  ((n=n+1))
                  ;;
    esac
  done

  stty "$savesetting"
  echo >&4
  result=""
  i=0

  while ((i<n)) ; do
    result="${result}${data[i]}"
    ((i=i+1))
  done

  echo $result
  return 0
}

final=$(getpass "password: ")
echo the password is $final
exit 0