input password & shell

Rex_chaos · 08-01-2003, 10:56 AM

Hi all,
The following script is for password input

echo "Input password for user abc..."
stty -echo #screen the input so that no one will see what u type
read password
stty echo

Here stty -echo works well. However, I would like it outputs "*" instead of what I type or nothing. Can I? How?

Thanks

slapNUT · 08-01-2003, 08:52 PM

http://expect.nist.gov/example/passwdprompt

Code:

 #!/depot/path/expect

# This script prompts for a passwd from stdin while echoing *'s

# Prompt MUST be passed as argument to avoid falling into the classic
# prompt-before-echo-has-been-disabled mistake.

proc getpass {prompt} {
    set sttyOld [stty -echo raw]
    send_user $prompt

    set timeout -1
    set passwd ""

    expect {
	-re "\r" {
	    send_user \r\n
	} -re "\010|\177" {
	    if {[string length $passwd] > 0} {
		# not all ttys support destructive spaces
		send "\010 \010"
		regexp (.*). $passwd x passwd
	    }
	    exp_continue
	} -re . {
	    send_user *
	    append passwd $expect_out(0,string)
	    exp_continue
	}
    }
    eval stty $sttyOld
    return $passwd
}

puts "The password you entered was: [getpass "Password: "]"

I ran across this while reading up on expect.