Your bug report

#52559: guix pull fails with `Unknown command: nix fish: nix show-derivation "~/.fr-sqOEpp/....-module-import-compiled.drv"

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 52559@debbugs.gnu.org.

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52559: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=52559
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