# \#system

**URL:** https://racket.discourse.group/tag/system/253.md

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## [How to use subprocess](https://racket.discourse.group/t/how-to-use-subprocess/3982)

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**Author:** [@AndreMayers](https://racket.discourse.group/u/AndreMayers)\
**Replies:** 4\
**Last updated:** [October 25, 2025, 5:48pm UTC](https://racket.discourse.group/t/how-to-use-subprocess/3982 "2025-10-25T17:48:37Z")

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In the following code, st-out is always #f. Why? I tried several variants of the following code. (set st-in (open the output file "out-file.txt")) (set st-out (open input file "in-file.txt" )) (define-values (newp…