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Full Discussion: Bash script to accept password and replace characters with * as they are typed
Top Forums Shell Programming and Scripting Bash script to accept password and replace characters with * as they are typed Post 302559840 by gary_w on Wednesday 28th of September 2011 09:46:12 AM
Old 09-28-2011
For the sake of argument, here is an example ksh script called "getpw" that I have in my bag of tricks. I did not write this, but saw it somewhere and saved it. My apologies to the author. Perhaps it can be adapted to bash, or at least studied to learn some new tricks :-)
Code:
#! /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

Last edited by gary_w; 09-28-2011 at 11:31 AM.. Reason: reformatted for readability
These 2 Users Gave Thanks to gary_w For This Post:
Chubler_XL vgersh99
 

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LEARN ABOUT HPUX

profile

profile(4)						     Kernel Interfaces Manual							profile(4)

NAME

       profile - set up user's environment at login time

DESCRIPTION

       If  the	file  exists,  it is executed by the shell for every user who logs in.	The file should be set up to do only those things that are
       desirable for every user on the system, or to set reasonable defaults.  If a user's login (home) directory contains a file named that  file
       is  executed  (via  the	shell's  before the session begins.  files are useful for setting various environment parameters, setting terminal
       modes, or overriding some or all of the results of executing

EXAMPLES

       The following example is typical (except for the comments):

	      #  Make some environment variables global
		  export MAIL PATH TERM
	      #  Set file creation mask
		  umask 22
	      #  Tell me when new mail comes in
		  MAIL=/var/mail/myname
	      #  Add my /bin directory to the shell search sequence
		  PATH=$PATH:$HOME/bin
	      # Set terminal type
		  echo "terminal: c"
		  read TERM
		  case $TERM in
		      300)	stty cr2 nl0 tabs; tabs;;
		      300s)	stty cr2 nl0 tabs; tabs;;
		      450)	stty cr2 nl0 tabs; tabs;;
		      hp)	stty cr0 nl0 tabs; tabs;;
		      745|735)	stty cr1 nl] -tabs; TERM=745;;
		      43)	stty cr1 nl0 -tabs;;
		      *)	echo "$TERM unknown";;
		  esac

       A more complete model can be found in

FILES

SEE ALSO

       env(1), login(1), mail(1), sh(1), stty(1), su(1), environ(5), term(5).

																	profile(4)
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