% echo $0
zsh
% zsh --
version
zsh 5.9 (x86_64-ubuntu-linux-gnu)
% xxd -v
xxd 2023-10-25 by Juergen Weigert et al.
% bc -v
bc 1.07.1
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
% printf '33 5e 34 0a'
|xxd -r -p>a.bc|bc -l
81
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