# Execute consecutive scripts
**URL:** https://discourse.julialang.org/t/execute-consecutive-scripts/137064
**Category:** General Usage
**Tags:** question, scripting
**Created:** [May 10, 2026, 7:20am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064 "2026-05-10T07:20:44Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@Chrysoberyl](https://discourse.julialang.org/u/Chrysoberyl)
#### Post date: [May 10, 2026, 7:20am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/1 "2026-05-10T07:20:44Z")
Is there a simple way to execute either multiple scripts consecutively, or execute a script with some additional imports? Consider this use case: I have a NN training script, and if I import `CUDA`, it trains on the GPU. Currently the script looks like this:
```julia
#import CUDA
using Flux, StatsBase
...
```
When I want to run this on the GPU, I uncomment the first line, but this is cumbersome. Ideally I want to trigger the GPU behaviour by specifying `import CUDA` in the command line:
```sh
julia --eval "import CUDA" ./nn.jl
```
but this does not achieve my objective.
---
### Author:  [@eldee](https://discourse.julialang.org/u/eldee)
#### Post date: [May 10, 2026, 7:40am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/2 "2026-05-10T07:40:30Z")
This sounds like an [XY problem](https://en.wikipedia.org/wiki/XY_problem). For your example the most straightforward approach would be to use `ARGS` (or e.g. ArgParse.jl) to supply an option (like `--device CUDA`) via the command-line. See also [Command-line Interface · The Julia Language](https://docs.julialang.org/en/v1/manual/command-line-interface/).
---
### Author:  [@Chrysoberyl](https://discourse.julialang.org/u/Chrysoberyl)
#### Post date: [May 10, 2026, 8:08am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/3 "2026-05-10T08:08:56Z")
This isn’t an XY problem. In my setup I have a master project that has no GPU package dependency, and there are derived projects based on CUDA and AMDGPU. The reason I do this is one monolithic project having all the CUDA/AMDGPU dependencies would have to download a ton of artefacts and create huge docker images.
I don’t think you can conditionally import a package. If you import the CUDA package while in the AMDGPU or master project environment it will give you an error. This is why I don’t think the command line approach would work.
---
### Author:  [@eldee](https://discourse.julialang.org/u/eldee)
#### Post date: [May 10, 2026, 9:04am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/4 "2026-05-10T09:04:15Z")
Could you provide a MWE showing what the environment structure looks like, and how `nn.jl` makes the switch between CUDA, AMDGPU and the CPU fallback?
Perhaps you could write package extensions for CUDA.jl and AMDGPU.jl?
---
### Author:  [@Ralph\_Smith](https://discourse.julialang.org/u/Ralph_Smith)
#### Post date: [May 10, 2026, 10:21pm UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/5 "2026-05-10T22:21:21Z")
Does
```julia-auto
julia --eval 'import CUDA; include("./nn.jl")'
```
work for you?
---
### Author:  [@abraemer](https://discourse.julialang.org/u/abraemer)
#### Post date: [May 11, 2026, 8:51am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/6 "2026-05-11T08:51:07Z")
> [@Chrysoberyl](#):
>
> I don’t think you can conditionally import a package.
Maybe package extensions could solve your issue elegantly.
Tutorial:
> [@Quick tutorial on package extensions](https://discourse.julialang.org/t/quick-tutorial-on-package-extensions/130923):
>
> Hello! I was reading the documentation on package extensions and felt that I needed some more detailed instructions. I wrote this tutorial based on what I learned (only today, so this is surely not an exhaustive tutorial). Quick tutorial on package extensions A package can have modules that are conditionally loaded based on what other packages are loaded. These are called extensions. Goal In the below text, there will be a package MyPackage. It will have an extension module MyExt which should …
---
### Author:  [@stevengj](https://discourse.julialang.org/u/stevengj)
#### Post date: [May 11, 2026, 11:59am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/7 "2026-05-11T11:59:27Z")
> [@Chrysoberyl](#):
>
> I don’t think you can conditionally import a package.
Yes you can.
```julia-auto
julia> if false; import LinearAlgebra; end
julia> isdefined(Main, :LinearAlgebra)
false
julia> if true; import LinearAlgebra; end
julia> isdefined(Main, :LinearAlgebra)
true
```
---
### Author:  [@Chrysoberyl](https://discourse.julialang.org/u/Chrysoberyl)
#### Post date: [May 13, 2026, 6:44am UTC](https://discourse.julialang.org/t/execute-consecutive-scripts/137064/8 "2026-05-13T06:44:54Z")
afaik `Flux.jl` automatically switches to CUDA/AMDGPU mode when CUDA/AMDGPU is imported