Introduction
This article focuses on the differences in behavior when executing a simple Bat script directly on a Windows 10 machine and executing it via CURL. Understanding these differences is essential for developers and administrators who rely on scripting for automation and remote management.
Simple Bat Script
The following is a simple Bat script:
@echo OFF
SETLOCAL ENABLEEXTENSIONS
SET ME=%~n0
SET PARENT=%~dp0
set VER=0.1
@echo %DATE%
Executing Bat Script Directly on Windows 10
To execute the Bat script directly on a Windows 10 machine, open a Command Prompt (cmd.exe) and navigate to the script's location using the CD command:
C:\Users\Username\Scripts>cd C:\Users\Username\Scripts\MyScripts
C:\Users\Username\Scripts\MyScripts>MyScript.bat
The output of the script will be displayed in the Command Prompt:
12/01/2022
Executing Bat Script via CURL on Windows 10
To execute the Bat script via CURL on a Windows 10 machine, you'll need to install a web server like Apache or IIS and configure it to handle Bat files as CGI scripts. Here's a simplified example using Python's built-in SimpleHTTPServer:
C:\Users\Username\Scripts>python -m SimpleHTTPServer 8000
Next, modify the Bat script to output its result as plain text:
@echo OFF
SETLOCAL ENABLEEXTENSIONS
SET ME=%~n0
SET PARENT=%~dp0
set VER=0.1
echo %DATE%
Now, create a new file called "handler.bat" in the same directory as the Bat script:
@echo OFF
REM Set the script file path
SET "SCRIPT_FILE=%~1"
REM Call the script using cmd.exe /c
CALL "%SCRIPT_FILE%"
REM Return the script output
echo %errorlevel%
Modify the Python script to call the Bat script via "handler.bat":
C:\Users\Username\Scripts>echo @echo Running Bat script via CURL
C:\Users\Username\Scripts>python -c "import os; import urllib.request; os.system('python handler.py %s' % urllib.quote('MyScript.bat'))"
C:\Users\Username\Scripts>echo @echo Bat script execution finished
Finally, execute the Python script via CURL:
curl -X POST -d "" http://localhost:8000/MyScript.bat
The output of the Bat script will be displayed in the Command Prompt:
12/01/2022
Differences in Behavior
Although both methods execute the same Bat script, there are differences in behavior:
- Environment Variables: When executing the script directly, the environment variables are set locally. When executing the script via CURL, the environment variables are inherited from the parent process (Python in this case).
- Error Handling: When executing the script directly, any errors are displayed in the Command Prompt. When executing the script via CURL, errors are returned as an integer error code.
In summary, executing a Bat script directly on a Windows 10 machine and executing it via CURL result in different behaviors. Understanding these differences is essential for developers and administrators who rely on scripting for automation and remote management.