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How can I execute a windows command line in the background, without it interacting with the active user?

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1  
Can you specify what you want to do? Do you want to perform a command on the command line in background or do you want to perform the whole command line in background, so it is unvisible from the desktop? –  omnibrain Oct 12 '10 at 6:20
    
i need two cane perform a command on the command line in background or do you want to perform the whole command line in background –  Mohammad AL-Rawabdeh Oct 12 '10 at 6:41

7 Answers 7

up vote 3 down vote accepted

Your question is pretty vague, but there is a post on ServerFault which may contain the information you need. The answer there describes how to run a batch file window hidden:

You could run it silently using a Windows Script file instead. The Run Method allows you running a script in invisible mode. Create a .vbs file like this one

Dim WinScriptHost
Set WinScriptHost = CreateObject("WScript.Shell")
WinScriptHost.Run Chr(34) & "C:\Scheduled Jobs\mybat.bat" & Chr(34), 0
Set WinScriptHost = Nothing

and schedule it. The second argument in this example sets the window style. 0 means "hide the window."

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@echo off&color 4a&title %~n0&AT>NUL                                                                 
IF %ERRORLEVEL% EQU 0 (                                                                            
    goto 2                                                                                           
) ELSE (                                                                                            
    echo.                                                                                       
)                                                                 
if not "%minimized%"=="" goto 1                                                             
set minimized=true & start /min cmd /C "%~dpnx0" & cls & exit                                   
:1                                                                                               
wmic process where name="cmd.exe" CALL setpriority "realtime">nul                         
echo set shell=CreateObject("Shell.Application") > %~n0.vbs                                 
echo shell.ShellExecute "%~dpnx0",,"%CD%", "runas", 1 >> %~n0.vbs                                  
echo set shell=nothing >> %~n0.vbs&start %~n0.vbs /realtime                                      
timeout 1 /NOBREAK>nul& del /Q %~n0.vbs&cls&exit                                                  
:2                                                                                         
echo %~dpnx0 frackin admin mode look up&wmic process where name="cmd.exe" CALL setpriority "realtime"&timeout 3 /NOBREAK>nul
:3                                                                                         
echo x=msgbox("end of line" ,48, "%~n0") > %~n0.vbs&start %~n0.vbs /realtime
timeout 1 /NOBREAK>nul& del /Q %~n0.vbs&cls&exit
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needs further editing i like grouping commands cls&echo hi&pause&ect –  strange Oct 9 at 2:49
    
Include in your answer an explanation of what the code does. –  Kevin Panko Oct 9 at 3:18

An example :

start /MIN /B grep -noid include *.c 1>log.txt 2>1&

Starts grep in backgound redirect both stdout && stderr to log.txt

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1  
This answer has already been given multiple times and was explained in great detail. Does your answer contribute anything that has not yet been said? –  Michael K Jan 28 at 14:33

This is a little late but I just ran across this question while searching for the answer myself and I found this:

START /B program

which, on Windows, is the closest to the Linux command:

program &

From the console HELP system:

C:\>HELP START

Starts a separate window to run a specified program or command.

START ["title"] [/D path] [/I] [/MIN] [/MAX] [/SEPARATE | /SHARED]
      [/LOW | /NORMAL | /HIGH | /REALTIME | /ABOVENORMAL | /BELOWNORMAL]
      [/NODE <NUMA node>] [/AFFINITY <hex affinity mask>] [/WAIT] [/B]
      [command/program] [parameters]

    "title"     Title to display in window title bar.
    path        Starting directory.
    B           Start application without creating a new window. The
                application has ^C handling ignored. Unless the application
                enables ^C processing, ^Break is the only way to interrupt
                the application.

One problem I saw with it is that you have more than one program writing to the console window, it gets a little confusing and jumbled.

To make it not interact with the user, you can redirect the output to a file:

START /B program > somefile.txt
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I like this answer best because it doesn't open another command window –  wisbucky Jan 3 at 16:17
START /MIN program 

the above one is pretty closer with its Unix counterpart program &

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I suspect you mean: Run something in the background and get the command line back immediately with the launched program continuing.

START "" program

Which is the Unix equivalent of

program &
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what is the fg equivalent? Can we close the command prompt and the porgram will still run? –  Nenotlep Oct 15 at 11:34
    
Also, I want to run a program in command prompt and return to it from time to time, like in screen - is that doable with this? I need to be able to close the command prompt but keep the running program usable. –  Nenotlep Oct 15 at 11:36

If you want the command-line program to run without the user even knowing about it, define it as a Windows Service and it will run on a schedule.

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1  
how do you do that? –  barlop Sep 30 '11 at 19:26
    
Alternatively you can make it a scheduled task - Control Panel->Administrative Tools->Scheduled Tasks or use the schtasks command in Windows XP and above (warning: schtasks is complicated). –  ultrasawblade Apr 6 '12 at 19:02

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