BAT file: Open new cmd window and execute a command in there

I'm trying to open a new command window in a BAT file:

start %windir%\system32\cmd.exe

After it opens, I'd like to execute a BAT command in the new window:

echo "test in new window"

How can I do this?

You may already find your answer because it was some time ago you asked. But I tried to do something similar when coding ror. I wanted to run "rails server" in a new cmd window so I don't have to open a new cmd and then find my path again.

What I found out was to use the K switch like this:

start cmd /k echo Hello, World!

start before "cmd" will open the application in a new window and "/K" will execute "echo Hello, World!" after the new cmd is up.

You can also use the /C switch for something similar.

start cmd /C pause

This will then execute "pause" but close the window when the command is done. In this case after you pressed a button. I found this useful for "rails server", then when I shutdown my dev server I don't have to close the window after.

Use the following in your batch file:

start cmd.exe /c "more-batch-commands-here"

or

start cmd.exe /k "more-batch-commands-here"

/c Carries out the command specified by string and then terminates
/k Carries out the command specified by string but remains

Consult the cmd.exe documentation using cmd /? for more details.

The proper formatting of the command string becomes more complicated when using arguments with spaces. See the examples below. Note the nested double quotes in some examples.

Examples:

Run a program and pass a filename parameter:
CMD /c write.exe c:\docs\sample.txt

Run a program and pass a long filename:
CMD /c write.exe "c:\sample documents\sample.txt"

Spaces in program path:
CMD /c ""c:\Program Files\Microsoft Office\Office\Winword.exe""

Spaces in program path + parameters:
CMD /c ""c:\Program Files\demo.cmd"" Parameter1 Param2
CMD /k ""c:\batch files\demo.cmd" "Parameter 1 with space" "Parameter2 with space""

Launch demo1 and demo2:
CMD /c ""c:\Program Files\demo1.cmd" & "c:\Program Files\demo2.cmd""

Source: http://ss64.com/nt/cmd.html

The above answers helped me. But still required some figuring out. Here is an example script I use to start 3 processes for web development. It results in 3 windows staying open, as they need to run continously.

Mongo is globally added to my path, so I don't need to cd like I do for the other two programs. Of course the path to your files will vary, but hopefully this will help.

:: Start MongoDB
start cmd.exe /k "mongod"

:: cd app directory, and start it
cd my-app
start cmd.exe /k "npm run dev"

:: cd to api server, and start that
cd ../my-app-api
start cmd.exe /k "npm run dev"

This is not very easy.

The best approach is to have the part of your script that you want to be executed in a "new window" to be in a separate .bat file. This might be impractical if e.g. you need a lot of state from the rest of your script (variables, etc). One option is to pass any values you need (e.g. dir to operate in) to the batch file:

start cmd.exe stuff.bat %this_dir%

If you have a large amount of state to transmit you might consider generating a batch file at runtime:

set foo=Hello, World
set list_me=%userprofile%

set tmpdir=c:\windows\temp
set tmp=%tmpdir%\tmp.foo

del /q /f "%tmp%"

echo.echo %foo%>>"%tmp%"
echo.dir "%list_me%">>>"%tmp"

start cmd.exe "%tmp%"

del /q /f "%tmp%"

Obviously this is a trivial example.

Thanks to all here in Stack Overflow; this solution solves the above question but is extended to automatically run these tasks:

1. I want to run my rails server
2. Run a rake jobs:worker for my delayed_job gem too
3. and Open default internet browser to show my page
4. finally, to leave a cmd window open for any extra commands during my session.

I guess my project is called "antiquorum."

Create an "init.bat" file in your %USERPROFILE% directory (open a cmd window and take a look at the path to the left of the cursor to know what %USERPROFILE% is)

@echo off
cd C:/projects/rails3/antiquorum
if "%1" == "antiquorum" GOTO start
if "%1" == "worker" GOTO worker
if "%1" == "server" GOTO server
if "%1" == "" GOTO end
:start
    start cmd /k %USERPROFILE%\init.bat worker
    start cmd /k %USERPROFILE%\init.bat server
    TIMEOUT 30
    start "" "http://localhost:3000/"
    GOTO end
:server
    rails s
    GOTO end
:worker
    rake jobs:work
:end

In a new command line window type: C:> init antiquorum

The code opens two more cmd windows and a browser. TIMEOUT avoids errors in the browser.

The :start section does the work. You can run tasks 1,2 or 4 separately by typing params as: server, worker, or none to leave a cmd opened in root of "antiquorum" project.

Enjoy.