Powershell: pipe input to command executed via call operator
I need to execute a batch file dynamically via the call operator (&). The batch file takes arguments, but I also need to pass in some input on stdin. I thought this would work:
$command = “somebatchfile.bat”
“y” | & $command arg1 arg2
However, the “y” is not passed through in stdin. If I execute the batch file like this:
“y” | somebatchfile.bat arg1 arg2
Then everything works as expected. But I cannot hard-code the path.
How can I execute a dynamically-determined batch file that takes arguments and pass through some standard input as well?
In an effort to reproduce this, I did the following:
call script2.bat %*
set /p x=”Enter: ”
echo foo %* %x%
> $command = “./script.bat”
> “yes!” | & $command whatever
Enter: foo whatever yes!
So it works as expected here. However, when I use it with the actual batch file (android.bat, part of the Android SDK), the input is not passed through to java.exe.
Here is the contents of android.bat:
rem Copyright (C) 2007 The Android Open Source Project
rem Licensed under the Apache License, Version 2.0 (the “License”);
rem you may not use this file except in compliance with the License.
rem You may obtain a copy of the License at
rem Unless required by applicable law or agreed to in writing, software
rem distributed under the License is distributed on an “AS IS” BASIS,
rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rem See the License for the specific language governing permissions and
rem limitations under the License.
rem Useful links:
rem Command-line reference:
rem don’t modify the caller’s environment
rem Set up prog to be the path of this script, including following symlinks,
rem and set up progdir to be the fully-qualified pathname of its directory.
rem Grab current directory before we change it
rem Change current directory and drive to where the script is, to avoid
rem issues with directories containing whitespaces.
cd /d %~dp0
rem Check we have a valid Java.exe in the path.
if not defined java_exe goto :EOF
rem Set SWT.Jar path based on current architecture (x86 or x86_64)
for /f “delims=” %%a in (‘”%java_exe%” -jar lib\archquery.jar’) do set swt_path=lib\%%a
rem Copy android.bat and its required libs to a temp dir.
rem This avoids locking the tool dir in case the user is trying to update it.
xcopy “%swt_path%” “%tmp_dir%\%swt_path%” /I /E /C /G /R /Y /Q > nul
copy /B /D /Y lib\common.jar “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\commons-codec* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\commons-compress* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\commons-logging* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\dvlib.jar “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\gson* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\guava* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\httpclient* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\httpcore* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\httpmime* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\layoutlib-api.jar “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\org-eclipse-* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\sdk* “%tmp_dir%\lib\” > nul
copy /B /D /Y lib\swtmenubar.jar “%tmp_dir%\lib\” > nul
rem jar_path and swt_path are relative to PWD so we don’t need to adjust them, just change dirs.
cd /d “%tmp_dir%”
rem The global ANDROID_SWT always override the SWT.Jar path
if defined ANDROID_SWT set swt_path=%ANDROID_SWT%
if exist “%swt_path%” goto SetPath
echo ERROR: SWT folder ‘%swt_path%’ does not exist.
echo Please set ANDROID_SWT to point to the folder containing swt.jar for your platform.
rem Finally exec the java program and end here.
REM set REMOTE_DEBUG=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000
call “%java_exe% %REMOTE_DEBUG%” “-Dcom.android.sdkmanager.toolsdir=%tools_dir%” “-Dcom.android.sdkmanager.workdir=%work_dir%” -classpath “%jar_path%;%swt_path%\swt.jar” com.android.sdkmanager.Main %*
The execution of the java app is prompting for license acceptance, which is why I want to pipe “y” into it. If I pipe directly it works, but if I pipe via Powershell’s call operator it does not.
“y” | android.bat update sdk -u -a -t 38
This does not:
$command = “android.bat”
“y” | & $command update sdk -u -a -t 38
Can anyone enlighten me?
I believe that using & to invoke an executable requires that the parameters are a String Array rather than just a String. I think PowerShell is getting confused on how to handle that input. So, per your example, something like this should pass inputs and arguments correctly:
$command = ".\script1.bat" $x = "update sdk|-u|-a|-t 38" "myinput" | & $command $x.Split("|")
results in the output
Enter: foo "update sdk" -u -a "-t 38" myinput
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