Hello, On the long run, I would like to perform some repeating tasks on a huge number of images. The main analysis is done with Python, but some parts can only be performed in ENVI. Therefore, I would like to create a function in IDL, which can be called from Python. I'm still at the very beginning. Right now, I would like to accomplish the following: Create a procedure/function in IDL, that: can be called from a Windows command line accepts an input argument I thought this should be rather simple, but it doesn't seem so. Here are some things I've tried so far: 1. In Windows command line: idl -e 'print, "123test"' Output: IDL Version 8.0.1 Microsoft Windows [...] Installation number: xxxxxx Licensed for use by: xxxxxx However, it doesn't print "123test". 2. Typing the following command: idl -e "t=DIALOG_MESSAGE('123test')" works as expected (a dialog box with "123test" opens). 3. I created a file called "test.pro" with this content: print, "123test" t=DIALOG_MESSAGE('123test') exit I start IDL by typing "idl" from the windows command prompt. Then, in the IDL command line, I type @test "123test" is then printed to the IDL command line, the '123test'-Dialog box opens, and then it exits to the Windows command line. 4. I tried to call the file from the Windows command line using: idl -e ".run 123test" idl -e ".run 123test.pro" idl -e '.run 123test' idl -e '.run 123test.pro' idl -e '@123test' However, each time, the only output is: IDL Version 8.0.1 Microsoft Windows [...] Installation number: xxxxxx Licensed for use by: xxxxxx Nothing else. I actually tried a lot of other things as well, but nothing worked. So, the question is: How can a IDL batch file be executed from the Windows command line?