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Camouflage STD IN on output (TRU64)

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Operating Systems Solaris Camouflage STD IN on output (TRU64)
# 1  
Old 02-07-2011
Camouflage STD IN on output (TRU64)
Hi guys, i have a new problem, even in scripting on KSH.
Given a string by standard INPUT (keyboard), i need to replace each character i print with this one '#' .
It's to camouflage password while digiting on command line.

For example:

----------------------------------
prompt$ example.ksh (enter)
insert password:

----------------------------------

and while i digit my passwd i must print on STD OUT the character # for each character.

Help me please! Smilie
# 2  
Old 02-07-2011
How about stty -echo before you read the password, and stty echo after? Depending on your shell this may stop the characters from appearing at all.

---------- Post updated at 11:25 AM ---------- Previous update was at 11:15 AM ----------

In more detail, I mean like this:
Code:
stty -echo
        printf "%s" "Input password: "
        read PASS
        echo
stty echo
echo "pass was $PASS"

I don't think vanilla ksh88 has any facility for reading characters one-at-a-time, so this may be the best you can do with a pure shell solution.
# 3  
Old 02-07-2011
This is a modification to a post by user 'LivinFree', a long time ago:

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 ${K:+#}
  done
  stty "$oldstty"
  echo
}

readString
echo "You entered: $S"

I just tested it in KSH on Solaris 10, so you could try it.
Last edited by Scott; 02-07-2011 at 01:52 PM.. Reason: It can go a bit doolally if you press ^C, so added 'trap'
This User Gave Thanks to Scott For This Post:
Corona688
# 4  
Old 02-08-2011
Thank u guys, i supposed that didn't exist a single command or option that get single char by stdin.I knew something about "stty -echo" but never tried.
I'll try your methods and will report you.

Thank u again.
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