λ findmnt /
TARGET SOURCE    FSTYPE   OPTIONS
/      /dev/sda1 bcachefs 
rw,relatime,compression=lz4,gc_reserve_percent=5,discard

λ guix --help > ~/halpy
Backtrace:
          11 (primitive-load 
          "/home/nckx/.config/guix/current/bin/guix")
In ice-9/eval.scm:
   293:34 10 (_ #<directory (guile-user) 705f90896f00>)
   196:35  9 (_ #<directory (guile-user) 705f90896f00>)
In ice-9/boot-9.scm:
  3297:17  8 (resolve-interface (guix ui) #:select _ #:hide _ 
  #:prefix _ #:renamer _ #:version _)
In ice-9/threads.scm:
    390:8  7 (_ _)
In ice-9/boot-9.scm:
  3223:13  6 (_)
In ice-9/threads.scm:
    390:8  5 (_ _)
In ice-9/boot-9.scm:
  3507:20  4 (_)
   2806:4  3 (save-module-excursion _)
  3527:26  2 (_)
In unknown file:
           1 (primitive-load-path "guix/ui" #<procedure 
           705f90ca97e0 at ice-9/boot-9.scm:3514:37 ()>)
In guix/ui.scm:
  1328:19  0 (_)

guix/ui.scm:1328:19: In procedure terminal-window-size: Operation 
not permitted