How to hide command output in CMD?

Question

I have a file .bat and in it is the command:

chcp 65001

Which results in output on CMD:

Página de código ativa: 65001

But I want this message, displayed after the command is executed, to be hidden to the user. What is the CMD command that does this?

NOTE: Use Windows 8.

Answer 1

There are 3 things to be done:

• @echo off

  Hides the commands typed by the user, apart from this it also hides the current folder that is browsing via command. Note that the @ serves to hide command response echo off.

  1. With echo on (pattern):

     echo Oi!
     
     pause
     

     Displays something like (note appearing a space before the first line):

     
     C: Users Desktop>echo Hi!
     Hi!
     
     C: Desktop Users>pause
     Press any key to continue. . .

     See that both responses and commands are displayed

  2. With echo off without @:

     echo off
     
     echo Oi!
     
     pause
     

     Displays something like (note appearing a space before the first line):

     
     C: Users Desktop>echo off
     Hi!
     Press any key to continue. . .

     See that both responses and commands are displayed

  3. With echo off with @:

     @echo off
     
     echo "Oi"
     
     pause
     

     Displays something like (note that does not appear a space before the first line):

     Hi!
     Press any key to continue. . .

• >nul

  The nul is an object that discards any written data, the > is the signal to point out where the output data should be recorded instead of displaying on the screen, note that for each new command you should add a new >nul, for example:

  @echo off
  
  echo Foo >nul
  
  echo Baz
  
  echo Bar
  
  pause
  

  The answer will be:

  Baz
  Bar
  Press any key to continue. . .

  If you do so:

  @echo off
  
  echo Foo >nul
  
  echo Baz >nul
  
  echo Bar >nul
  
  pause
  

  The answer will be:

  Press any key to continue. . .

  And with >nul in charge pause will have no answer:

  @echo off
  
  echo Foo >nul
  
  echo Baz >nul
  
  echo Bar >nul
  
  pause >nul
  

• 2>&1

  • The 0 is the stdin, is the input, that is what is sent to commands, for example user-typed commands, or commands in a script . bat or . sh
  • The 1 is the stdout, i.e., output, or output
  • The 2 is the stderr, error output, when some fault occurs

  
  In this case we don’t need 0 because the echo off already hides the input data, so we use 2 to direct the output to 1, so for example, if you do this:

  @echo off
  
  cd DiretorioInexistente >nul
  
  pause >nul
  

  Something like:

  System cannot find specified path.

  But if I do this, it won’t show anything:

  @echo off
  
  cd DiretorioInexistente >nul 2>&1
  
  pause >nul
  

Concluding

If you want to hide everything but the mistakes (I think it’s preferable), use it like this:

@echo off

meucomando argumento1 argumento2 >nul

If you want to hide everything, use it like this:

@echo off

meucomando argumento1 argumento2 >nul 2>&1

I don’t have much knowledge, if you have any faults to comment on or anything.

So the final code can look like this:

@echo off

chcp 65001 >nul 2>&1

echo Olá

pause

Note: When using the chcp may eventually appear a message like this:

The system cannot write to the specified device.

To "fix", you will need to click on the title bar > Properties > Font > Select the Lucida Console font

Answer 2

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• Update Redirecionamento de erros + saídas normais para arquivo:

  ---

• Error Output + Standard Output for filing cabinet

• stderr + stdout for filing cabinet

  ---

To hide the possessed mistakes + warnings + exits normal, but redirect these possible outputs to a file, we just point to a filing cabinet receive the redirecting of output 'stderr' to the exit 'stdout': 2>&1 == stderr > & stdout

Basically, doing the redirecting for a filing cabinet, where this will receive the exit stderr who will have his way out, in turn, too redirected to the exit stdout, thus:

commando >.\arquivo.txt strr>&stout

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To test this behavior we can run a command that returns a normal output and another error return, already redirecting the error from the error output to and normal output, where we are redirecting to a.txt file.

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(chcp 1252 & echo/Saída normal & copy /b 0 nul) >arquivo.txt 2>&1

The commands added in the txt file. as Normal outputs + redirected errors to the standard output:

---

Página de código ativa: 65001 => of command:chcp 1252

Saída normal=> of command:echo/Saída normal

O sistema não pode encontrar o arquivo especificado. => of command:copy /b 0 nul

---

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In short, the command returns in its default output (stdout) to the filing cabinet: arquivo.txt, where possible output errors stderr are being redirected to the exit stdout.

---

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A short commando that works both in the command line and as in the bat concealing exits, errors and warnings...

>nul chcp 65001 or >nul 2>&1 chcp 65001

Basically redirects output to dispositivo nul no visible output from the control.

• Some examples of use and your demeanor for

  1. Standard exits = echo/exemplo

  2. Warnings = chcp 65001

  3. Error = dir /o0

@echo off & cls & echo/ 

echo/exemplo 1 :: não vê nada & echo/ 
>nul^
      (
       echo/exemplo 1 :: você não vê nada
       chcp 65001
       dir /o0  ^< este comando gera erro^!! :: Formato de parâmetro incorreto - "0". 
       echo/exemplo 1 :: você continua sem ver nada^!! 
       ) 2>nul

echo/exemplo 2 :: ve soh saida/avisos & echo/
2>nul^
      (
       echo/exemplo 2 :: você não vê possíveis erros mas vê as saídas
       chcp 65001 
       dir /o0   ^< este comando gera erro^!! 
       echo/exemplo 2 :: e você não viu o erro do comando^!!
       echo/
       )

echo/exemplo 3 :: você vê somente possíveis erros & echo/
>nul^
      (
       echo/exemplo 3 ::: você só vê o erro
       chcp 65001
       dir /o0   ^< este comando gera erro^!! :: Formato de parâmetro incorreto - "0".
       echo/exemplo 3 ::: e você soh ver o erro^!! 
       )

rem :: Ou ainda dessa forma ::

@echo off 

rem :: nem erro nem saída ::

dir /o0  >nul 2>&1 ^< esse comando gera erro e você não vê o erro
dir ,    >nul 2>&1 ^< esse comando gera saída e você não vê

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