如何使用Perl输入密码并用'*'替换字符？

Question

我有一个Perl脚本,要求用户输入密码.我怎样才能回复'*'代替用户输入的字符,因为他们输入的字符？

我正在使用Windows XP/Vista.

Answer 1

在过去,我使用了IO :: Prompt.

use IO::Prompt;
my $password = prompt('Password:', -e => '*');
print "$password\n";

Answer 2

如果您不想使用任何包...仅适用于UNIX

system('stty','-echo');
chop($password=<STDIN>);
system('stty','echo');

Answer 3

您可以使用Term :: ReadKey.这是一个非常简单的示例,有一些检测退格键和删除键.我在Mac OS X 10.5上测试了它,但根据ReadKey手册,它应该在Windows下运行.该手册指出,在Windows下使用非阻塞读(ReadKey(-1))会失败.这就是为什么我使用基本上的ReadKey(0)getc(更多关于libc手册中的 getc ).

#!/usr/bin/perl                                                                                                                                                                                                

use strict;                                                                                                                                                                                                    
use warnings;                                                                                                                                                                                                  
use Term::ReadKey;                                                                                                                                                                                             

my $key = 0;                                                                                                                                                                                                   
my $password = "";                                                                                                                                                                                             

print "\nPlease input your password: ";                                                                                                                                                                        

# Start reading the keys                                                                                                                                                                                       
ReadMode(4); #Disable the control keys                                                                                                                                                                         
while(ord($key = ReadKey(0)) != 10)                                                                                                                                                                            
# This will continue until the Enter key is pressed (decimal value of 10)                                                                                                                                      
{                                                                                                                                                                                                              
    # For all value of ord($key) see http://www.asciitable.com/                                                                                                                                                
    if(ord($key) == 127 || ord($key) == 8) {                                                                                                                                                                   
        # DEL/Backspace was pressed                                                                                                                                                                            
        #1. Remove the last char from the password                                                                                                                                                             
        chop($password);                                                                                                                                                                                       
        #2 move the cursor back by one, print a blank character, move the cursor back by one                                                                                                                   
        print "\b \b";                                                                                                                                                                                         
    } elsif(ord($key) < 32) {                                                                                                                                                                                  
        # Do nothing with these control characters                                                                                                                                                             
    } else {                                                                                                                                                                                                   
        $password = $password.$key;                                                                                                                                                                            
        print "*(".ord($key).")";                                                                                                                                                                              
    }                                                                                                                                                                                                          
}                                                                                                                                                                                                              
ReadMode(0); #Reset the terminal once we are done                                                                                                                                                              
print "\n\nYour super secret password is: $password\n";   

Answer 4

您应该查看Term :: ReadKey或Win32 :: Console.您可以使用这些模块读取单个键击并发出"*"或其他内容.