In Bash:
--8<---------------cut here---------------start------------->8---
$ guix --version | awk '{print $4; exit}'
Backtrace:
           5 (primitive-load "/home/ambrevar/.config/guix/current/bin/guix")
In guix/ui.scm:
    464:2  4 (show-version-and-exit _)
In ice-9/format.scm:
  1590:19  3 (format #t "Copyright ~a 2019 ~a" "(C)" "the Guix authors\n")
   261:19  2 (format:format-work "Copyright ~a 2019 ~a" ("(C)" "the Guix authors\n"))
    70:10  1 (format:out-obj-padded _ _ _ _)
In unknown file:
           0 (display "the Guix authors\n" #<output: file 1>)

ERROR: In procedure display:
In procedure fport_write: Broken pipe
--8<---------------cut here---------------end--------------->8---

-- 
Pierre Neidhardt
https://ambrevar.xyz/