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Re: [tlug] Linux Quiz: Call For Questions

On Sun, Apr 27, 2014 at 06:00:09PM +0200, Bruno Raoult wrote:
> On Sun, Apr 27, 2014 at 5:15 PM, Daniel A. Ramaley <
> > wrote:
> > On 2014-04-28 at 00:06:13 Stephen J. Turnbull wrote:
> > > Or how about a password with a literal backspace in it?
> >
> > I'm having trouble figuring out how a password input method would know
> > whether you meant to backspace, or to insert a backspace character. I
> > like it! How about a password with a literal carriage return?
> >
> > It seems in my terminal i can type literal backspace and carriage
> > returns by preceding them with ctrl-q. For me to want to use one in a
> > password, i'd have to be confident that all password input methods would
> > accept workarounds like that though.
> >
> I am not sure to understand... Of course a ctrl-q can help for some
> characters.
> For some only.
> Tell me how to input the the zero character? Would this one be forbidden?
> And 2?
> and 3? and many others, beside backspace?

Technically, according to POSIX.1-2008[0], every character/byte sequence is
permitted in filenames except for the slash '/' and NULL character '\0'. 

Input is possible if the terminal or editor etc allows for it. In vim for
example, to input NULL type ^V10 (NULL byte ahead: ) in insert mode. In the
Urxvt terminal emulator, you can write to the terminal by inputting the
character code in hexadecimal, so every character could be entered, including at
password prompts.

      Section 3.170. 

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