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Re: [shell-script] Ler da entrada padr�o sem ecoar na tela


From: Fbio Berbert de Paula
Subject: Re: [shell-script] Ler da entrada padro sem ecoar na tela
Date: Tue, 3 Jul 2001 11:07:57 -0300

Fala Cid,

> Usei o read em um script, mas estou perguntando uma senha
> q está aparecendo na tela. Como perguntar, em bash, algo
> através do read ou algo semelhante sem ecoar na tela?
> Vejam o que fiz:
> 
> echo -n "Conectar como: "
> read USERNAME
> echo -n "Senha: "
> read SENHA

Use:

echo -n "Conectar como: "
read USERNAME
echo -n "Senha: "
stty -echo
read SENHA
stty echo
echo ""
echo Sua senha é $SENHA


O segredo está no stty ;o)



Atenciosamente,
-- 
------------------------------------------------------
Fábio Berbert de Paula     address@hidden
------------------------------------------------------
SysAdmin & *UNIX* Developer            Linux Solutions
(021) 526-7262 ramal 21
----------------  Yes, I have a Palm  ----------------

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From: # aurelio marinho jargas <address@hidden>

olás,

@ 3/7, Fábio Berbert de Paula:
> > Usei o read em um script, mas estou perguntando uma senha
> > q está aparecendo na tela. Como perguntar, em bash, algo
> > através do read ou algo semelhante sem ecoar na tela?
> > Vejam o que fiz:
> >
> > echo -n "Conectar como: "
> > read USERNAME
> > echo -n "Senha: "
> > read SENHA
>
> echo -n "Conectar como: "
> read USERNAME
> echo -n "Senha: "
> stty -echo
> read SENHA
> stty echo
> echo ""
> echo Sua senha é $SENHA


o read pode fazer tudo, imprimir o prompt e esconder a senha:


read -p 'Conectar como: ' USERNAME
read -p 'Senha: ' -s      SENHA


ele tem um monte de opções massa:

------------------------------------------------------------
man read
------------------------------------------------------------
  -a aname
         The  words  are  assigned to sequential indices of the array variable
         aname, starting at 0.  aname is  unset  before  any  new  values  are
         assigned.  Other name arguments are ignored.
  -d delim
         The  first  character  of  delim is used to terminate the input line,
         rather than newline.
  -e     If the standard input is coming from a terminal, readline (see  READ­
         LINE above) is used to obtain the line.
  -n nchars
         read  returns after reading nchars characters rather than waiting for
         a complete line of input.
  -p prompt
         Display prompt, without a trailing newline, before attempting to read
         any  input.   The  prompt is displayed only if input is coming from a
         terminal.
  -r     Backslash does not act as an escape character.  The backslash is con­
         sidered  to  be part of the line.  In particular, a backslash-newline
         pair may not be used as a line continuation.
  -s     Silent mode.  If input is coming from a terminal, characters are  not
         echoed.
  -t timeout
         Cause read to time out and return failure if a complete line of input
         is not read within timeout seconds.  This option  has  no  effect  if
         read is not reading input from the terminal or a pipe.

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


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