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Full Discussion: Password hiding in UNIX
Top Forums Shell Programming and Scripting Password hiding in UNIX Post 302841385 by Scott on Wednesday 7th of August 2013 09:33:54 AM
Old 08-07-2013
If you need to write the password to a file as "*****" just write a literal "*****" to the file. So long as you know there's no way to read it back as the entered password!

Here's something to display "*" as you type a password:
Code:
trap 'stty "$oldstty"; exit' 0

readString () {
  printf "Enter password: "
  oldstty=$(stty -g)
  stty -icanon -echo min 1 time 0
  while :; do
    K=$(dd bs=1 count=1 2>/dev/null) 
    [ ! "$K" ] && break
    S=$S$K
    printf "%c" ${K:+\*}
  done
  stty "$oldstty"
  echo
}

readString
echo "You entered: $S"

A variation on this old post: https://www.unix.com/302494498-post3.html
These 2 Users Gave Thanks to Scott For This Post:
 

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dxchpwd(1X)															       dxchpwd(1X)

NAME
dxchpwd - Create or change password program SYNOPSIS
dxchpwd dxchpwd -r | -l dxchpwd [-r | -l] -q dxchpwd [-r | -l] -u username OPTIONS
If dxchpwd is invoked without any options, it is assumed that the current user's password is to be changed. The following options are also accepted: Tells dxchpwd that the password change is to be done for a Local user. This can be combined with the -u and -q options. Tells dxchpwd that the password change is to be done for a NIS user. This can only be done from a NIS master and can be combined with the -u and -q options. Tells dxchpwd to query the user for the user name of the account whose password is to be changed. Tells dxchpwd to change this user's password. DESCRIPTION
The dxchpwd command lets you change your password. When you invoke the dxchpwd command, the program prompts you for the old password and then for the new password. Next, the program asks you for the new password again, to verify that you have typed it correctly. Note that the passwords are not displayed on the screen. Your new password must meet the length requirements specified by the authorization database for the user whose password is being changed. If your system is running with enhanced security, you may have to choose a password from a list of randomly generated passwords or you may be prohibited from changing your password until its minimum lifetime has expired, as specified in the authorization database. EXAMPLES
The following example requests that the password be changed for user smith: dxchpwd -u smith FILES
Password file Protected Password Database dxchpwd executable SEE ALSO
X(1X), xdm(1X), passwd(1) dxchpwd(1X)
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