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Hello, It seems, I've found a small bug in guile-scsh. Namely, when I tried to use constructions like (run (cat in_file) (> out_file)) I got the error "undefined variable shell-open" I found in the original distribution of scsh the following definitions, which I think is worth to add to the end of syscalls.scm: ;;;;=====>>>>> to be added to the end of syscall.scm <<<<<<<==== (define (shell-open path flags fdes) (move->fdes (open-fdes (stringify path) flags #o666) fdes)) (define open/create+trunc (bitwise-ior open/write (bitwise-ior open/create open/truncate))) (define open/write+append+create (bitwise-ior open/write (bitwise-ior open/append open/create))) ;;;;=====>>>>> end of addition <<<<<<<==== -- Best regards, Valentin.