Shell Scripting Tip: Password Prompts
Posted: Tue Aug 06, 2013 11:10 am
Just something I was kicking around here, it was clever enough that I wanted it saved somewhere. The following bash script would present you a prompt for a password, and echo * for the output:
This is generating the * using IFS (internal field separator) trickery. The limitation of this is that all characters, including backspace, ctrl-h, ctrl-u would be interpreted as *.
Code: Select all
echo -n "Enter password: "
# Suppress output of password.
unset PASSWORD
while IFS= read -r -s -n1 pass < /dev/tty ; do
if [[ -z $pass ]]; then
echo
break
else
echo -n '*'
PASSWORD+=$pass
fi
done